miriam-
I'm going to do some testing on the bottom of the machine. :-) I'm pulling the useful parts off all my donor heads to make room in the shop. I currently have almost 30 machines, and that's way too many! I've finally gotten good at saying NO to free ones, but I got a bit overrun before getting to that point. I've been having a hard time wrapping my head around scrapping old machines, but I'm getting past that.