My first time posting here, sorry if the category is wrong.
I really would want to construct my own self-ballbusting device but I've run out of ideas on how to do it easily and preferably cheap.
Something like a semi-hard paddle rotating over and over or backwards and forwards, or something fist/ball-like thumping backwards and forwards.
Doesn't have to be electrical, mechanical contraptions could also do in a pinch.
Any ideas?
Thanks!
I really would want to construct my own self-ballbusting device but I've run out of ideas on how to do it easily and preferably cheap.
Something like a semi-hard paddle rotating over and over or backwards and forwards, or something fist/ball-like thumping backwards and forwards.
Doesn't have to be electrical, mechanical contraptions could also do in a pinch.
Any ideas?

Thanks!