OK, this should be the final mod to the U87s unless something really out-of-the-ordinary is necessary. My friend Dave cut me some capsule-mount shims with this Star Trek Replicator device out of some nice 1/8th in acrylic stock. I needed a 1/4 inches, so I CA glued two together, and shimmed up the capsules so they're at the appropriate height, now. My goal was to do this with as little disassembly as possibly, and all went well. Shims, before, and after.