You can make shims from beer or pop cans too and try to get it as close as you can
I only moved the top cap on 2 of the bunks, and haven’t put any shim in yet. If I can’t find shim I’m happy with, I’ll push the cap back down and pull the bunk up. It’s a little over 1/16” variance, and the carriage is back on. I’m gonna take more off of the mill ends, and measure thickness at different spots.