I have a metal allergy. Unfortunately, the chinrest on my violin has two metal bars on it that contact my skin when I'm playing, and cause me an allergic reaction. (My chinrest is similar to that shown in this picture).
I've tried covering the metal bars by putting a sock over the entire chinrest (looks weird and feels awkward) and by covering just the metal bars in painters tape (it eventually wore away and left weird residue).
Aside from buying a new chinrest, what can I do to prevent myself from reacting to my violin?