I made my version of the device that Barefoot Princess used in this post: http://www.femaledom.com/forum/showp...&postcount=216

I went to the 99 cent store and bought a rubber ball, a squeegee and some electrical tape. I carved out a 1/2 inch hole about one inch into the ball, and then I unscrewed the handle from the squeegee and inserted it into the hole in the ball. I wrapped it with about 3-4 feet of electrical tape to hold it in place and to cover the ball for color uniformity (see photo).

Let me tell you, this little device is absolutely sinister. I put on my bb briefs (with a scrotum hole to expose only my balls (see photo))
and tried it a few times on myself, and it works like a charm. I find this to be quite effective for self-busting - much better than a ball in a sock or even my own hand, but I still hold back. My wife & I have yet to play with it, but we will soon.

All in all, an excellent gizmo for $2.97 (plus tax)