OK buckwheat do you have 9 pennies ?
9 pennies stacked = 12.94 mm
1 pennys think ness is roughly 1.60 mm
Dimes are 1.30 mm, so ten dimes will work too
I like the outside the box thinking using stacked change. 9 pennies would be 14.4 though. I just need to buy a dang caliper.