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Old 01-12-08, 01:29 PM   #1
rankin116
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Fork Post mount threads ruined...I think?

I was installing disk brakes onto a new fork with post mounts. Here's a link to the fork. When I was doing this, I stripped the thread on the inside of the bottom post mount. At least I think that is what you would call it. I was installing the bolt and it slipped, so I took it out and the threads at the end of the bolt were filled with the material from the inside of the post mount. I swapped bolts and tried that, but it would not tighten well also.

So I have no idea what to do. Can this be fixed? Thanks for the help.
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Old 01-12-08, 01:44 PM   #2
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My advice is to stop, put the tools down, see what other ideas people come up with, but don't touch anything until at least tomorrow when you've had time to think and weigh your options. You may not be beyond help, but one more mistake and you could be. With that said:

I guess you could tap it one or two sizes larger, but you may have to drill the disc brake mount hole slightly larger to accomodate the lager bolt. This would work, but may weaken the brake mount so don't do it, just think about it for now.

I also thought of another option which would be to install a longer bolt of the same size backed with nut. This shouldn't hurt anything if it all fits together and is probably a better option.

Another option which may work is to use a heli-coil which is basically a threaded coil that you screw in and I think cement into place after drilling and tapping out the hole larger. I've never been in so deep as to actually use one though.

And as I'm sure you now know aluminum is soft. When in doubt just use blue locktite, then snug is plenty tight.

Last edited by biknbrian; 01-12-08 at 01:53 PM.
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Old 01-12-08, 03:11 PM   #3
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It's new??
Send it in for warranty replacement...

" hey, it came that way.."
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Old 01-12-08, 04:34 PM   #4
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Heli-coil

http://www.emhart.com/products/helicoil.asp
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Old 01-12-08, 04:43 PM   #5
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I think that is exactly what I need. Do you know where I can buy what I will need? Home Depot, Lowes, etc.? Thanks!
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Old 01-12-08, 05:21 PM   #6
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Possibly. More than likely, NAPA, AutoZone, maybe Pep Boys. It's gonna be spendy ~$30 but you have the tools to do about a dozen of them, then you'll just have to buy the inserts.

They are invaluable for those 'Oh crap!' moments.
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Old 01-12-08, 06:22 PM   #7
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Possibly. More than likely, NAPA, AutoZone, maybe Pep Boys. It's gonna be spendy ~$30 but you have the tools to do about a dozen of them, then you'll just have to buy the inserts.

They are invaluable for those 'Oh crap!' moments.
Thanks! $30 isn't too bad I guess. IF I could send it back under warranty, it would cost some money for shipping and take at least two weeks. So $30 is well worth it too me.
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Old 01-12-08, 06:45 PM   #8
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Yer welcome.Let us know how it goes, 'kay?
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Old 01-12-08, 07:24 PM   #9
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Helicoils work great for this problem just measure the depth of the hole so that you can mark the drill bit so you dont drill to far into the forks lowers and ruin the fork. Stripping out threads is not ussually covered under warrenty. Just make sure you drill straight and plumb for a disc brake mount if your not sure you did use a slightly longer bolt and but a v-brake pad conical washer set under the head of the bolt so it sits flush with the caliper keeping it alighned right.
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Old 01-13-08, 03:35 PM   #10
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Well I bought the heli-coil this morning and I just got back from a ride. It worked great. I did drill it straight, so I didn't need the conical washer, but thanks for the tips. I didn't need to go too deep either. Thanks all!

Alan
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Old 01-13-08, 04:18 PM   #11
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Great! Glad it worked out ok for you.

How close was I on the price?
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Old 01-13-08, 04:45 PM   #12
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Right on actually. $31 and change.
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