Hi JV,
May I recommend bariatric surgery? Did a double abdominal band today that helped significantly to reduce microphonics in a pair of TFK EL11 T tubes.:
The procedure involves taking a piece of self gluing high temp silicone tape and stretch it tight so that the ends overlap. Push down one end over the other, and it is done. The tape can be removed by peeling it off or cutting it, and there is no residue. It only sticks tightly together when you join two pieces together.
Do you remember the rusty K-R 6C5 metal tube?
Since I don't have your skills in refinishing and painting (and no lime green paint) I just put on some make-up. Had a piece of silicone tape peeled off from a tube where it did not help (popping noises - requires heat treatment of pins) and a small blue rubber band. Put this no cost application on the rusty tube:
Not perfect, but better looking...Could not get a label to stick to the silicone; had to use scotch tape.
Necessity is the mother of invention, so where do unnecessary inventions come from?