So, why remove metal again? The piston is one piece. That would seem sort of hard to understand. Well picture this. You have a pair of razor blades made of diamond edges. Just one flat super sharp diamond. Thru the piston you have a pin made of diamond. It sticks out the piston on each side by two inches. You set the piston and pin on the razor blades. The piston rolls one way every time. It is out of balance
