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  1. #1
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    Stripped water bottle thread NOT the head

    how do you fix that? It's the thread that was forced into the bike by a bike mechanic in SA. I only noticed this now while trying to take it out. What do you do? Right now i've got string wrapped around the cage and the frame to keep it together. Is this permanently damaged? The screw thread is smooth...completely so. I tried a new screw but it doesn't fit easily and I didn't want to force it again.

    Suggestions?

  2. #2
    Senior Member Ziemas's Avatar
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    Perhaps a Riv-Nut would work. Or a really small heli-coil.

    http://www.emhart.com/products/helicoil.asp

    http://www.aimfasteners.com/about_rivnut.html

  3. #3
    Senior Member Torchy McFlux's Avatar
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    Are the threads completely gone? Because it's just a bottle bolt. If the boss is just cross-threaded, run a tap through it and remember not to pull too hard on the wrench when tightening down the bolt afterwards.

  4. #4
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    Tap?

    what's a tap? Sorry - I'm pretty ignorant here.

  5. #5
    50/50 Road/eBike Commuter kmcrawford111's Avatar
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    A tap is a tool for cutting female threads (the threads inside the hole). If you go to a decent tool shop, you don't have to buy a whole set of taps, or even more to the point, a whole set of both taps and dies (dies are tools for cutting male threads) and end up with an empty wallet and a bunch of tools you'll never use. I just bought a die from Bike Tools Etc. and they were excellent. This is what is needed, along with a tap wrench/handle:

    http://www.biketoolsetc.com/index.cg...em_id=WE-315D4

    Sears Hardware also might carry it by itself.
    Last edited by kmcrawford111; 05-12-08 at 01:46 AM.

  6. #6
    Senior Member
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    I realize this is a BIKE forum, and not a sailboat forum, but in the sailing world when we strip something like that, we fill with epoxy, re-drill, and then re-tap. This includes for aluminum masts, for example.

    Perhaps it's a good thing I'm not a bike mechanic.
    Cannondale Synapse Sport 5

  7. #7
    A little North of Hell
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    Quote Originally Posted by Ziemas View Post
    Perhaps a Riv-Nut would work.
    +1

    riv-nut or nutsert.
    [SIGPIC][/SIGPIC]
    XXXI

  8. #8
    Sometimes knows stuff. rmfnla's Avatar
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    Drill the hole through both sides of the tube and use a 2" bolt and a nut

    Kidding; a Riv-nut is the easiest & best-looking repair.
    Today, I believe my jurisdiction ends here...

  9. #9
    Elitist Troglodyte DMF's Avatar
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    Quote Originally Posted by daoswald View Post
    I realize this is a BIKE forum, and not a sailboat forum, but in the sailing world when we strip something like that, we fill with epoxy, re-drill, and then re-tap. This includes for aluminum masts, for example.

    Perhaps it's a good thing I'm not a bike mechanic.
    That would work on a bike, too, but since the OP doesn't know what a tap is, he's not going to fix it any way. Needs to go to a shop.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  10. #10
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    He doesnt need a tap in my opinion... well he can make one using an allen bolt?? Just go to lowes and get a milimetric m5 allen bolt and put that thing in there. The other solution could be get an allen in inches almost the same size of the one that broke, I believe the water botle size is M4? The inches one will be a little bit bigger so it should work fine. I know is not a super fancy fix but it will work with the tools he might have at home.

    Thanks

  11. #11
    `````````````` CaptainCool's Avatar
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    Quote Originally Posted by ultraman6970 View Post
    He doesnt need a tap in my opinion... well he can make one using an allen bolt?? Just go to lowes and get a milimetric m5 allen bolt and put that thing in there. The other solution could be get an allen in inches almost the same size of the one that broke, I believe the water botle size is M4? The inches one will be a little bit bigger so it should work fine. I know is not a super fancy fix but it will work with the tools he might have at home.

    Thanks
    No, that won't work. The shaft of the bolt will be too large. Anyway, a tap is made of hardened steel, and designed to cut where a normal bolt would try to smash.

  12. #12
    N8N
    N8N is offline
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    I guess my approach would vary depending on how the original "braze-on" is constructed. If it's a real braze on I would try a tap. If it's, say, a Cannondale which uses rivnuts from the factory I would probably just drill it out and insert a new rivnut. You probably would have to remove the bottom bracket to get the broken pieces out though if that bothers you.

    nate

  13. #13
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    Actually I did something similar in my commuter, to hold the BB cable guide. Just used a drill then a M5 fixed to look as a tap, done. The thread was perfect.


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