Rounded derailleur hanger bolts
Today I was removing my rear derailleur hangar to try and stop an incessant creak. However, the bolts were very hard to slacken which surprised me as I didn't think they would be overly tight. Out of the three bolts I only managed to slacken one with a 2.5 mm allen key. The other two feel as if the allen key is rounded. I have tried a 3mm and it's far too big for the hole and a T10 torx is not touching it either. Any suggestions? Or is it drill the bolt and use an EZ-out?