Should I install a piece of thick/wide (King or old Elkhart-era side-mounted Conn 20K - which might be easier to fit) sousaphone guard wire on this 6th (small upper) bow, or not?
I'm thinking that I would rather wear through lacquer or silver on a guard plate, rather than through the instrument itself...
(My hand contacts the upper back part of that bow, and moves the #1 slide in when tuning for the 5th partial pitches, B and C, is critical...
...I actually just insert my hand into that (left-rotated) "D"-shape, and move the #1 slide without even actually grasping it.)
![Image](https://i.imgur.com/qTCPwFT.jpg)