Report Staytrem tremolo arm in Fender Mustang Discussion Posted October 19, 2016 Installed a Staytrem arm recently. I love it. The old arm I was always fighting with. The grub screw chewed up the first arm I had in there, and I could never keep the arm where I wanted it. After replacing the chewed up arm with an import Strat arm that I had ground the threads off of, I put a little ball bearing between the arm shaft and the grub screw. That worked a little a bit better but it was still something I just tolerated. The Staytrem is nearly perfect. The tension on the arm travel is just right and the adjustable arm height really dials it in. The arm is always where I want it.