Sweet. Thanks to all the contributions to this thread. .0005 is mighty tite! I do not have precise enough instruments to een measure that, but I'm wondering if these washers should be hand lapped. I'm gonna order these as soon as i decide on a piston. I'd really like to find someone who would put the black oxide coating on a wiesco for me, that is unless pro x or someone already makes a coated piston for the LT