A lockable ball-ball.

Inspired by my favorite Domina, I invented this little nasty device.

It's build over one of those 'tennis balls' with holes in, which are rather popular i.e. in camping grounds, for the fact, that their 'shattering potential' is rather limited.
I bought my balls in my local toy store, at 2 balls for 3 €/$.

 

The stick, which is in fact locking the testes inside the ball, is a piece of 10 millimeter aluminum tube, with a hole drilled through either end, to hold the padlocks.

The way it works is, that you put your ball sack, and your testicles down into the ball, upon which you push the aluminum tube through two of the holes in the ball, as far 'ack' as you can possibly get it.
In other words: there is absolutely no intention, that your testicles should be able to pass under the aluminum tube, neither both of them, nor one of them at a time.
Once the aluminum tube is in place, you put the padlocks through the holes at the end of it, and now the ball-ball is locked into place (at least until you can get at the key(s))...

I have an ongoing quest, to find a ball a little bigger than the one I've used here. The one I've used here measure a little less than 3" across, but I'd like to have one, which is supposed to measure 4" to 4½" across. this would allow for the cock to be placed inside the ball as well, and then I'd have (yet another) chastity-device.
So, if you should happen to know of a place, where I can get a thing like that (actually, I'd love to get a hollow metal ball, which I could alter to fit the purpose), I'd be almost hilarious, to be hearing from you..!