Hi
I recently bought a second hand dura ace 9 speed derailleur (rd-7700). When I went to fasten the cable the bolt wouldn’t tighten and I realised the helicoil in the derailleur body had backed out. The threads on the bolt are not in great condition (which maybe caused the problem?). I have removed the helicoil now. I assumed the derailleur body would have good threads, but they don’t look good at all.
My dilemma is should I try to replace the helicoil?
Or should I tap the derailleur body for a larger size bolt, with no helicoil?
Is there anything else I could do?
Another second hand derailleur will be about £20. It seems a shame to junk such a nice derailleur - it obviously hasn’t done many miles, but I don’t want to spend much on tools (and I don’t have any taps or helicoil tools)
Any ideas? For those curious, the helicoil is meant to be there.
Cheers