[CG]

Originally Posted by cleszkie

... Use thin horseshoe shaped shims to get everything mocked up (large flat washers with a slot cut into them). They can be installed and removed quickly without removing the mount bolts. When you have established the final shim thickness required at each of the mounts, remove the stack of horseshoe shims at each location and replace with permanent shims of the correct thickness, without the slot cut. This will require pulling the mount bolts to install, but the permanent shims will not be able to work themselves out.

Good Grief, what a simple and great idea. One of those things that just makes me wanna slap my forehead ... duh! I definitely would have been trying to do something like this the hard way.