New answers tagged braze-on
Get a pedal thread insert. here's a description of how to install one: http://thegoldenwrench.blogspot.com/2010/12/repairing-stripped-pedal-thread.html
Most bike petals come in 2 different thread sizes. Get a petal set that uses the larger thread and just use the harder than aluminum steel shaft of the petals to cut the new threads into the crank arm. Brute force simple and should outlast the bike unless you crack the aluminum. Just my 2 cents worth. Hope it helps. Oh yes, lots of thread cutting lubricant ...
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