I have had two of those bolts break off. Once when I hit a ridge of ice pushing into my hangar, the other time one was just broken when I took the wheel pants off. Both times I was able to extract the broken bolts using a drill press, left hand drill, and an easy-out. Has to be done carefully but it can be done. And, an excuse to buy a few more tools!
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
Master Pilot Award, UFO Member.
RV-12 N37JP 120176, built 2011, sold 2020.
One Week Wonder Build Team, OSH 2018.