[tomp913]

Some good tips here. I've been finding these shims very handy too: Polypropylene Shims - Lee Valley Tools They were selling smaller sets for $4 but I don't see that package anymore. I've been using them to set door heights on cupboards so I can accurately mark hinge locations. The thinnest ones are only 1/32" thick so you can do some fine tuning with them.

I have a set of these, and you're correct, they are very handy. The photo shows them being used to check size/spacing of some small drawer fronts before assembly and attaching to the drawers.