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  1. #1
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    front derailleur bolt snapped

    Installing a nos deore dx fd last night. I was using a diy shim bc the clamp was 31.8 and the seat tube was 28.6, so I wanted to make sure i got it on tight. after tightening all i could i realized it was too low, started loosening it and the bolt snapped.

    2 questions
    1)was the bolt just weak or are there other reasons this happens?
    2)how do I get the little nut that is somewhat embedded in the derailleur arm out?

    thanks!

  2. #2
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    Quote Originally Posted by Chris Chicago View Post
    .... so I wanted to make sure i got it on tight.

    You probably overtightened it
    setting up the fracture. It's likely your shim was off size a bit causing you to feel you need more hold than it was designed for. Check dimensions carefully when you next install it (the shim has to be very close to 1/16") and if you feel you need more hold, use a tacking agent like the stuff 3m makes for light hold Post-it notes (comes in a stick), or carbon assembly paste.

    The nut system is designed with exactly your problem in mind, just set a small punch against it through the clamp and tap it out the back. Odds you can remove what's left of the screw once it's out. You have a choice of buying an original screw, or using one made for water bottle bosses, or any stainless steel 5x.8 metric screw available at the hardware store.
    Last edited by FBinNY; 01-14-11 at 09:30 AM.
    FB
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    An ounce of diagnosis is worth a pound of cure.

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  3. #3
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    thanks for the info. I used an old screw driver and a book as a hammer to push it out, I will try the tacking agent tonight.

  4. #4
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    Quote Originally Posted by Chris Chicago View Post
    thanks for the info. I used an old screw driver and a book as a hammer to push it out, I will try the tacking agent tonight.
    What are you going to do when all books are Kindles?
    FB
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    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  5. #5
    pmt
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    Quote Originally Posted by FBinNY View Post
    What are you going to do when all books are Kindles?
    Use one that's broken and out of warranty.

  6. #6
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    Quote Originally Posted by pmt View Post
    Use one that's broken and out of warranty.
    yes, but they could replace War and Peace in terms of striking power.
    FB
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  7. #7
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    the book i used, "managerial economics" sustained near fatal wounds. kindle might have come through less mangled.

    i should just buy a hammer for the office

  8. #8
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    Quote Originally Posted by Chris Chicago View Post
    the book i used, "managerial economics" sustained near fatal wounds. kindle might have come through less mangled.

    i should just buy a hammer for the office
    Next time, go outside and find a rock.
    FB
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    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  9. #9
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by FBinNY View Post
    Next time, go outside and find a rock.
    Or use your head.

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