GREQ
Headphoneus Supremus
+1 on the "fortitude" part as well. Once I managed to but the blunt end of a needle halfway through my thumb doing that. I went to a few sewing stores after that and discovered that no one seems to make thimbles sized for adult male thumbs.
ouch!
I mostly just poked the needle through initially and pressed the blunt end down on the cutting mat the rest of the way through.
Quite a slow process, but this time no blood!