An elastrator is like any other type of tourniquit. (I can't spell) Remember your first aid instructions, loose a tourniquit every 20 min, no longer. And yes, here is the fun part. If you can do this to a guy who is blind folded and convince him you're castrating him, playing with the knife to sell him on his harsh future, then cut the band instead of his nuts he'll believe he has just been cut because it will feel just like it. The burning of the blood rushing back into the balls and sac will have him begging. Then you can massage him really well and do it to him again.