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stripped allen bolt head.

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stripped allen bolt head.

Old 04-30-12, 08:58 PM
  #1  
trek330
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stripped allen bolt head.

I stripped the head of the allen bolt that holds the jockey wheel on my rear derailleur.Any tricks to turn the thing?I have an extra bolt but how can I get the stripped one off?
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Old 04-30-12, 09:12 PM
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dsbrantjr
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First try using a new, non-ball end hex driver on the screw after applying something like PB Blaster to the screw threads. There might be enough meat left to get it moving. There might be an inch-sized driver which might fit tightly or be able to be driven in also. There is also a material called Drive Grip which can be applied to the fastener head which may give a better grip. There are also "easy out" tools which may be useful. If all of these fail I would reach for my Dremel tool with a thin disc blade and cut a slot for a straight screwdriver.
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Old 04-30-12, 09:44 PM
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mechBgon
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If the other pulley bolt will come out, remove the other bolt and turn the cage itself.
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Old 05-01-12, 01:18 AM
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jolly_ross
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+1 for easyouts, I've rescued a few stripped Allen heads with them in the past - also good for munged cleat screws.
(Although they are misnamed - they should be called extremelydifficultouts, but that probably wouldn't fit on the box).
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Old 05-01-12, 06:02 AM
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I_like_cereal
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Easyout +1
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Old 05-01-12, 08:18 AM
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Pff, easyout - this:
Originally Posted by mechBgon View Post
If the other pulley bolt will come out, remove the other bolt and turn the cage itself.
You sometimes need a ball-end allen key to get at the upper one.
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Old 05-01-12, 08:34 AM
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A little dab of JB weld and a disposable allen key.
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Old 05-01-12, 09:37 AM
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I orderered some easyouts.Thanks for the advice.
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Old 05-03-12, 04:30 PM
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Be careful with easyouts. When they break off in a hole they are a real pain to get out. I would drill out the head and then remove the rest of the screw with pliers/vice grips after disassembly. Another neat trick I found over the years is get a couple of left handed 1/8" drill bits. When you have to drill out a bad fastener, sometimes the bit will catch and spin it out. If it doesnt you still have your hole for the easy out.

-SP
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Old 05-03-12, 05:03 PM
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i have had great success with a tool called the "sock it out" they work awesome
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Old 05-03-12, 05:21 PM
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Be sure of going to the store and get a millimetric (metric) set of Allen tools this time


Originally Posted by trek330 View Post
I stripped the head of the allen bolt that holds the jockey wheel on my rear derailleur.Any tricks to turn the thing?I have an extra bolt but how can I get the stripped one off?
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Old 05-03-12, 08:56 PM
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Clean the allen head and an allen wrench very well with acetone or mineral spirits and dry completely, then apply a drop or two of Super Glue Gel inside the allen bolt head and insert the allen wrench. Allow to sit for a few minutes as the gel sets slower than regular SG. Remove the stripped bolt and dip the end of the wrench with the bolt attached into acetone to get your wrench back.
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Old 05-03-12, 09:50 PM
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...or just rotate the pulley cage to unscrew it from the stuck bolt. Just sayin'
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