Well, then I got to make my own edition of the slave-swing. It was actually an email from a page visitor, which started the project, as he kindly requested to get some measures, in order to build his own.
My edition is slightly different from the original one, but this gives you the opportunity of choosing the one you like the best.
I have been using a piece of a wooden shelf, from my local Silvan hobby-shop, in a type of wood named 'Nyatoh'.

Here you get the measures for my edition, which are approximate, and - for the US measures - calculated from the approximate metric measures. (Click the picture to see it full-size).
I haven't stated the measures for the buttplug, as I expect that the buttplug is to be dimensioned for the actual asshole, intended to use the slave swing just the same..*S*

As you might see from the following pictures, I have used a piece of shelve, which I had lying around anyway, so the 'notch' in the shelve, at the top, does not have any significance to this project.
To start with, I have made a 1:1 model from a piece of paper, as it is a lot easier to fold a piece of paper, as to fold a piece of wooden shelf.
Next I attached the paper to the shelf, using push-pins, in all the centers of the holes, giving me exact locations for the holes, in the wood (the holes left, after removing the push-pins again).
Finally I've used a white coloring pencil to draw the outlines of the paper-model onto the wood, as well as to mark the holes, as the white coloring pencil is a lot easier to see on the dark wood, as a normal pencil would be.

This is what the wood looks like, having removed the paper-model, and having marked the centers of the holes, as well as some of the circumfrences.
Next task is to saw out the shape, i.e. by using a compass saw, or like I did, a fret saw, as well as drilling the ball's hole with a cone drill.
Having done that I managed to get a functioning setup with my drill, as well as a few other bits and pieces, in order to manufacture the buttplug.
Having these two pieces made, I used some energy on sanding them both everywhere.
Finally I mounted the buttplug onto the swing plate, by means of some glue, and a screw from the bottom side, as well as I decided to mount a pair of strengthening pieces next to the ball-hole, in order to prevent the wood from breaking.
In order to get a nice look, and a washable surface, I coated the whole swing with two layers of Hempel Classic Varnish, of course with a light sanding in between the two layers of varnish.


And this is what the slave swing looks like, when suspended from the ceiling with a single piece of rope, running from the ceiling hook, down through the right hand side hole, behind the supports, up through the left hand side hole, up through the ceiling hook, and back down through the backside hole of the swing.

This manner of suspending it, will allow me to tighten the suspension rope, after having inserted the butt plug, and gotten my ball sack down the appropriate hole in the swing. The only thing left to do, is to secure the rope, keeping the swing at the right height over the floor.



And thus the slave swing does what it is intended to do.
A variation:
I got the idea, that the cock could be 'strapped onto the swing' by means of a common antenna-bracket, with a few modifications, and as this if working rather fine, I'll not keep the idea from you.
As you'll see from the picture, above, the first one is an ordinary bracket, build for i.e. screwing the antenna (or whatever) onto a pipe.
At the other picture, you can see the modifications I made. I exchanged the hex nuts for two nuts with 'ears', through which I've drilled a total of 4 holes (2 in either).
To give you the full picture, I then inserted a small padlock through the holes, and locked it, which quite significantly dis-allows the turning of the nuts, which in effect locks them into place.


And here you can see what it looks like, when the idea is applied to the slave swing..*S*
It is (most obviously) an option to mount more than one bracket onto the slave swing, in order to fully 'strap the cock down' onto the slave swing, but in this case I guess, that it would be best, if the only bracket, with lockable nuts, is the one closest to the cock-head.
Version 2:
I suddenly got the idea, that the slave swing and the suction tube might do well together, so I made a selfbondage session from that idea.

Actually I'm testing two things in one session, if the suction tube will work attached to the slave swing, and if the 'shield' which I've mounted on the suction thing does what it is supposed to - and I can only say "YES".



At the pictures above, you can see how it has been mounted.
The shield, and the arms holding the shield, are actually ripped from my fret sawing machine, when I realized, that it would fit the purpose perfectly.
And, just as an explanation of the purpose of the shield: I found that the suction tube has one disadvantage. If it is allowed to go all the way down my cock, the vacuum supplied by my vacuum cleaner is not forceful enough to keep the thing going, as the skin over my pubic bone seals off the airflow.
Thus the need for a device, which could ensure, that the tube is forced to keep a distance to the pubic bone, in order to keep the stimulation going.
I have made a video, of the session, and you'll get to it, if you click here:
My edition is slightly different from the original one, but this gives you the opportunity of choosing the one you like the best.
I have been using a piece of a wooden shelf, from my local Silvan hobby-shop, in a type of wood named 'Nyatoh'.

Here you get the measures for my edition, which are approximate, and - for the US measures - calculated from the approximate metric measures. (Click the picture to see it full-size).
I haven't stated the measures for the buttplug, as I expect that the buttplug is to be dimensioned for the actual asshole, intended to use the slave swing just the same..*S*

As you might see from the following pictures, I have used a piece of shelve, which I had lying around anyway, so the 'notch' in the shelve, at the top, does not have any significance to this project.
To start with, I have made a 1:1 model from a piece of paper, as it is a lot easier to fold a piece of paper, as to fold a piece of wooden shelf.
Next I attached the paper to the shelf, using push-pins, in all the centers of the holes, giving me exact locations for the holes, in the wood (the holes left, after removing the push-pins again).
Finally I've used a white coloring pencil to draw the outlines of the paper-model onto the wood, as well as to mark the holes, as the white coloring pencil is a lot easier to see on the dark wood, as a normal pencil would be.

This is what the wood looks like, having removed the paper-model, and having marked the centers of the holes, as well as some of the circumfrences.
Next task is to saw out the shape, i.e. by using a compass saw, or like I did, a fret saw, as well as drilling the ball's hole with a cone drill.
Having done that I managed to get a functioning setup with my drill, as well as a few other bits and pieces, in order to manufacture the buttplug.
Having these two pieces made, I used some energy on sanding them both everywhere.
Finally I mounted the buttplug onto the swing plate, by means of some glue, and a screw from the bottom side, as well as I decided to mount a pair of strengthening pieces next to the ball-hole, in order to prevent the wood from breaking.
In order to get a nice look, and a washable surface, I coated the whole swing with two layers of Hempel Classic Varnish, of course with a light sanding in between the two layers of varnish.


And this is what the slave swing looks like, when suspended from the ceiling with a single piece of rope, running from the ceiling hook, down through the right hand side hole, behind the supports, up through the left hand side hole, up through the ceiling hook, and back down through the backside hole of the swing.

This manner of suspending it, will allow me to tighten the suspension rope, after having inserted the butt plug, and gotten my ball sack down the appropriate hole in the swing. The only thing left to do, is to secure the rope, keeping the swing at the right height over the floor.



And thus the slave swing does what it is intended to do.
A variation:
I got the idea, that the cock could be 'strapped onto the swing' by means of a common antenna-bracket, with a few modifications, and as this if working rather fine, I'll not keep the idea from you.
As you'll see from the picture, above, the first one is an ordinary bracket, build for i.e. screwing the antenna (or whatever) onto a pipe.
At the other picture, you can see the modifications I made. I exchanged the hex nuts for two nuts with 'ears', through which I've drilled a total of 4 holes (2 in either).
To give you the full picture, I then inserted a small padlock through the holes, and locked it, which quite significantly dis-allows the turning of the nuts, which in effect locks them into place.


And here you can see what it looks like, when the idea is applied to the slave swing..*S*
It is (most obviously) an option to mount more than one bracket onto the slave swing, in order to fully 'strap the cock down' onto the slave swing, but in this case I guess, that it would be best, if the only bracket, with lockable nuts, is the one closest to the cock-head.
Version 2:
I suddenly got the idea, that the slave swing and the suction tube might do well together, so I made a selfbondage session from that idea.

Actually I'm testing two things in one session, if the suction tube will work attached to the slave swing, and if the 'shield' which I've mounted on the suction thing does what it is supposed to - and I can only say "YES".



At the pictures above, you can see how it has been mounted.
The shield, and the arms holding the shield, are actually ripped from my fret sawing machine, when I realized, that it would fit the purpose perfectly.
And, just as an explanation of the purpose of the shield: I found that the suction tube has one disadvantage. If it is allowed to go all the way down my cock, the vacuum supplied by my vacuum cleaner is not forceful enough to keep the thing going, as the skin over my pubic bone seals off the airflow.
Thus the need for a device, which could ensure, that the tube is forced to keep a distance to the pubic bone, in order to keep the stimulation going.
I have made a video, of the session, and you'll get to it, if you click here:











