So i ordered 6 of these and they showed up only being 0.0010 thick. My plans were to use these buttons on a QB36 that im doing my first home tune on. Well it looks like im going to need something in the 0.0050 to 0.0070 range. That way i can sand to fit. The gun im working on is a QB36. I would imagin the tolerances are no where near what they are on the European guns. Anyway, can someone tell me how much clearance i should have between the installed buttons and the compression chamber.