Oh, and one other question: What do you use as a binder for the silicon carbide powder? I assume you don't just use it dry?I'm apparently not as sharp as granny on these matters. What grit of silicon carbide powder would you guys recommend, to lap a bored 12L14 or Cast Iron cylinder? I am planning on using an o-ring rather than an iron piston ring. (This is for a Webster.) Any suggestions on where to buy small quantities?