Bicycle Mechanics - Stripped rear derailleur cable bolt
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06-04-07, 10:23 AM
Have an XTR rear derailleur on my Santa Cruz BLT and being an amateur I have apparently managed to strip the cable connector bolt. [The reason I am not 100% sure is that there is this strange little spring that looks like the bolt might thread into but can't seem to make it happen and there seems to be too much play when i insert the bolt for me to have stripped it that badly]. If I have stripped it, expect the answer is throw it away and buy a new one, but thought I would circulate this on the off chance that there is something else I can do.
If it's just the cable connector bolt (your "spring" is making me wonder if your talking about the barrel adjuster) you can retap it for a slightly larger bolt.
Is this the bolt you're talking about right in the middle of the pic?
06-04-07, 12:17 PM
Yes, that's the one. Guess the next obvious question is how one goes about getting it retapped?
06-04-07, 01:35 PM
Could the "spring" be the threads pulled out of the derailleur? Sounds like it needs a helicoil.
06-04-07, 01:52 PM
Ah excellant! That seems very plausible. Was really struggling to understand where that "spring" materialised from, particularly as couldn't see it as a part in the tech spec. Obviously can't get it back in the from the inside but will give it a try from the outside and will let you know how I get on. Thanks very much
06-04-07, 01:53 PM
Sounds like it needs a helicoil.
BTW, what's a helicoil?
a helicoil is a metal piece that threads into a stripped hole and provides new threads. Your best bet, though, is to go buy a tap that's a bit bigger than the existing hole, and a matching bolt for that tap. Then, you just use the new bolt. you may also need to drill the hole out a little bigger on the metal tab that grips the cable.
06-04-07, 02:45 PM
And stop cranking so hard on it when you tighten it. Stainless bolts like to eat aluminum threaded holes anyway. A little anti-sieze would help. bk
06-04-07, 03:07 PM
Given that the hole apparently already had a helicoil (which I somehow pushed out the back), presumably this means the hole had been stripped once before? Or, is that how they come new? In which case it seems like a pretty silly system! I guess it is the former.
Will have to learn to stop flexing my muscles on poor little aluminium holes - guess it is also time for some torque wrenches! Glad I at least found out what is going on. Thanks for all the tips.
I have stripped a couple of those nuts on the derailleur bolt assemblies (bolt, allen head nut, and washer). One is still in service. Removing the washer from under the nut let some good threads reach the bolt.
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