Preping and old Ringmaster that I was given. Mounted a Fox 25 that I had, as my other OS 20FP is spoken for on my Flight Streak.
I have the muffler, a stock Fox muffler with mount homes both top/bottom and side/side. This needs the top/bottom holes. It's not for a 4-40 bolt, that seems certain. A 2-56 seems the right dia (a 5/64 drill bit shank (.077") will just slide into the hole) A 2-56 bolt is .085" dia and seems like it wants to start, but only goes in freely about 1/8".
What size is this supposed to be? I can redrill and tap for 4-40 easily enough, but I prefer not to.
Gary