With scumbags you have to deal with them like a scumbag.
Call the fruitcake and tell him - with authority, that you KNOW he's a scumbag because of his past judgements etc and because of that you WILL resort to street style tactics and his jag will lose parts, his tires may not hold air, his home may sustain damage etc and that he can't prove SHIT that you made these threats...but they WILL happen unless he meets you with cash.
Period.
I've done it before and I'll do it again. Never lost a dime. F these scumbags.