If you can, borrow or Buy a good micrometer, measure every piece in your stack before glue up. In 2009 I bought a cheap digital micrometer from Lowes..it worked OK for a while, got another one in 2011. It started having trouble zeroing out even with a new battery. So i am now on #3..I just bought a iGaging absolute orgin digital on sale for $40. So far it is good. Looking back I should have bought a nice Mitutoyo in 2009..