Thanks for the tip
@robgul. Just wanted to check if I've understood where you're saying to put the shim. I think I read in a previous post on here that you'd successfully used a ph jig with pallet boards, which is probably something that I'll do as well. So, if I have a pallet board clamped into the jig with the board standing vertically (to make pocket holes at one end of the board), does the shim go on the baseplate of the jig, with the end of the board standing on it, or does it go between the face of the board and the columns of the jig (to increase the overall thickness of the wood that's clamped into the jig?) I'm guessing that it's the latter option and that I'll be drilling through the shim and into the pallet board?