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  1. #1
    mtnjam
    Reputation: ryman's Avatar
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    May 2004
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    688

    M8 X 1.25 PermaCoiling on Chainstay/Rocker threads

    I have a stripped chainstay thread on my Titus Switchblade. It's the M8 x 1.25 bolt that connects the rockers to the chainstay that I either accidently crossthreaded or over tightened. Either way the bolt doesn't snug up very tight. The bolt is in there well enough to not just slip out, but I want to keep it as tight as possible.

    I have a PermaCoil kit now with a 21/64" drill bit to drill out the old thread. I have the inserts, installer and the PermaCoil tap. When I take the M8 x 1.25 thread inserts and turn them onto the M8 bolt (no drilling or tapping, peramcoiling done yet) the bolt still seems kinda loose in the insert. Is this normal for a heli/perma coil to be loose prior to inserting it?
    Just ride down there and jump off something for crying out loud...

  2. #2
    mtbr member
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    Oct 2009
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    14
    The insert will be properly sized when it's threaded into the threads cut by the special tap.

  3. #3
    mtnjam
    Reputation: ryman's Avatar
    Join Date
    May 2004
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    688
    Perma Coiling done. Worked very well. The threads fit just fine now.

    The hardest part of the job was getting through the psychological factor of putting a drill bit to the frame and cutting out the stripped threads.
    Just ride down there and jump off something for crying out loud...

  4. #4
    Photog Cyclist.
    Reputation: 23mjm's Avatar
    Join Date
    Oct 2005
    Posts
    401
    Buy a torque so you won't over tighten again--I haven't found a manufacture you doesn't give torque specs for their pivot bolts.
    We ride and never worry about the fall
    I guess that's just the cowboy in us all
    (Tim Mcgraw)

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