Old 11-29-18, 02:06 PM
  #6  
Random Tandem
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Join Date: Oct 2014
Location: Vancouver, Canada
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Bikes: 1974 Teledyne Titan, 1970's Sekine, 1980's Kuwahara Tandem, plus a few dozen

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If you are ready to throw them away (so you are not worried about slopping work with a grinder or dremel), I would try cutting a slot in the bolt head and using a flat screwdriver. Cheap and perhaps uses tools you have.
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