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Dad2TnR
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Is there a machinist in the house?
10/21/15 at 11:52pm
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I recently picked up a steel frame with a replaceable derailleur hanger.  The powder coat was apparently sprayed on too thick and I managed to ham fist two of the three attachment screws to the point that they sheared off in the frame.

One screw plus the wrong seem to hold everything in place pretty well, but I don't think that's a real good long term solution.

The frame manufacturer recommended drilling out the sheared screws (M3 holes) and enlarging the holes to M4 and retapping them.  I'm nervous to do this myself, so I'm looking to see if anyone has better tools and experience than I do?  Undecided

I can pay in cash, beer, bike parts or any combination thereof.
  
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DursRemote
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Re: Is there a machinist in the house?
Reply #1 - 10/22/15 at 6:10pm
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I would definitely try to remove those screws before drilling/tapping to the next size up. You have several options here, easiest would probably be to use an EZ-out. A set like this should do the trick:
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Basically you're going to drill a small hole into the sheared off bolt, then use the included reverse-spiral bit with your drill on reverse, which should pull it right out. It's a good set of tools to have around.
  
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pughjetsound
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Re: Is there a machinist in the house?
Reply #2 - 10/31/15 at 1:17pm
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M3's are next to impossible to extract with an ez-out.  I agree with the frame guys and suggest stepping up to an M4.  It's a better size anyway.  M3's shouldn't be used on a bike.  Go to Mcmaster.com and order a couple of drill bits, M4 taps, and tap handle.  The quality will be better than you would find at Home depot, lowes, or tractor supply and it will make the job simple and painless.

ps   is this the ritchey frame I saw at lake norman last weekend?
« Last Edit: 10/31/15 at 1:21pm by pughjetsound »  
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AkA
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Re: Is there a machinist in the house?
Reply #3 - 11/06/15 at 5:28pm
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Don't know if you fixed the problem or not but I'm willing to help out if you need the help still?..  Been machining and programming for the last 19 yrs. We could bring it into the shop on a weekend and have it done in about an hour.
  
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