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Nice motion Kim!My first thought on the shim would be to make it from steel and bond it place with some JB clamped up tight. Make it a little oversized so it could be dressed back down to the original surfaces.Silver solder would be ok but there is always some risk involved with something going wrong on your finished part. Dave
I would leave the shim alone. Also powder coat the yokes and tie as onr piece if possible to avoid changing dimensions among the parts. Don't coat the tie bars. Don't coat anything until you have the valve gear made and all assembled. There is a bracket still to be attached to the yokes and the clearance in the slots to be verified.
I spent a lot more than one day getting things to move smoothly, so you did very well.