I did consider a rectangular cover for the FS-100, but I think it would really dwarf the 211. As it is, the FS-100 is huge, and the only thing that saves the look is that it's black. I want to black out the lam bolts too, but I'm starting to think it's not such a good idea to remove them, even one at a time. Maybe I can figure a satisfactory way to paint them in place. Mike, these FS-100s are about six or seven years old. Would you happen to remember what the lam bolts are made of, and on the chance that they're actually brass or brass plated, whether they're coated with anything?
After reading the replies here about mounting the OPT, I've pretty well decided to mill aluminum trim pieces to hold the feet to the chassis. I can install 1/4"-20 studs in the trim, so each piece will serve as both cover and holddown. I can't think of anything else that won't look like "hardware." Even smooth, stainless carriage bolts have a look I don't care for when they're on the top of a chassis. Again, my goal is to have *no* hardware visible from the front, top or sides of the amplifiers.
Yes, I milled the trim rings for the tubes myself, as well as the mounting system for the 211. It's not entirely visible in the photo, but the 211 mounting system consists of two machined plates and four standoffs underneath, and the trim ring on top. The ceramic socket is supported only by its bottom surface, which is how all these sockets were intended to be mounted.
Keep those suggestions coming!
