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  #21  
Old 03-11-2012, 08:08 AM
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rocketbob rocketbob is offline
 
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It it didn't shatter (which they do, even in aluminum) then since its likely a two flute tap at least 50% of the threads remain which would hold a screw just fine, especially considering the light load of the canopy glass.
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  #22  
Old 03-11-2012, 08:44 AM
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Azemon Azemon is offline
 
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I have been a machinist for over 25 years and would indeed try to use a tap extractor first. But it must be done very carefully. I own and have used several
times a Hansvedt EDM or Spark Eroder. They are absolutely the best way to
remove broken taps as they do not damage the treads. Good luck.

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  #23  
Old 03-11-2012, 09:35 AM
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I had to have a broken tap removed from a motorcycle cylinder head a couple of years ago. The EDM worked very well. After that experience, I wouldn't even mess with trying to remove it myself. Now, I would just take it to a machine shop that has an EDM.
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