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  1. #1
    Senior Member dynne's Avatar
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    Stripped screw on bolt-on derailleur hangar?

    I'm trying to rebuild an old Takara 10 speed. The bolt-on derailleur hangar is misaligned so that I can squeeze a wheel on. I've tried to remove the screw that keeps the derailleur misaligned every which way, PB blasted it, but no luck. See below.



    Any way to salvage it or should I figure out a way to chop it right off? I have other old derailleurs kicking around that I could swap out.

    Thanks for your help.
    Can't stop this ride.

  2. #2
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    File or saw off the head and pop it through. Yoy might be able to salvage the nut or you may not, but there's plenty of RDs with these hangers in bike shop junk boxes so scavenging a new and nut shouldn't be hard.
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  3. #3
    Junior Member
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    Get a small torch and heat it up until you can see the redness in the bolt. It will come out like butter.
    1970 Zeus Pista all original
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  4. #4
    Senior Member dynne's Avatar
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    Thanks, should be easy.
    Can't stop this ride.

  5. #5
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    Thats what i would do heat it up and undo it with a wrench. If that don't work i would try an easyout drill bit

  6. #6
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    I can't imagine being able to apply enough heat to the bolt to loosen it without ruining the paint.

    Those hangers have little nibs on the back that are supposed to locate the hanger in the dropout. Looks like this one has rotated enough that the nib is on top of the dropout. So the first thing I would try is to remove the derailleur from the hanger and hit the hanger with a hammer so that it rotates back into alignment. That might relieve enough tension that you can remove the screw.

    If that failed, I'd cut a slot in the bolt head with a Dremel tool with a cutoff disc or a a hacksaw blade. When the slot reaches the hanger, you should be able to inset a flat blade screwdriver in the slot and twist the head off.

  7. #7
    Certified Bike Brat Burton's Avatar
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    So maybe I`ll state the obvious. The centre of that has been messed up from trying to use a phillips screwdriver on it but the corners of the bolt head are pristine. Doesn`t anyone own boxend wrenches?

    Yeah - a torch will screw up the paint. On the other hand a couple 10mm boxend wrenches should have that out of there with very little effort.

  8. #8
    Senior Member dynne's Avatar
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    ^ I can't believe I didn't think to try the 10mm wrench...
    Can't stop this ride.

  9. #9
    Senior Member dynne's Avatar
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    Yup, worked like a charm.
    Can't stop this ride.

  10. #10
    Senior Member sonnetg's Avatar
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    why not use a ratchet/socket? I had the same issue with screwdrivers. Those things are way to tight for any screwdrivers to tackle. Looks like the nut seems to be fine. You may have to use a 5-10 mm socket or wrench.

    Good luck.

  11. #11
    Senior Member sonnetg's Avatar
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    Oh...never mind. Glad you were able to take care of it :-)

  12. #12
    Certified Bike Brat Burton's Avatar
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    Quote Originally Posted by dynne View Post
    Yup, worked like a charm.
    LOL Every story should have a happy ending!

    Hope the rest of the job goes just as easily!

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