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Just got this advice from a friend who races motor cycles.
More than likely he's had broken bolts in Aluminum a few times.
Sounds doable.
SMAW process 6013 x .1875 rod at 100 amps. Set source to straight polarity at .5 pulse or so. Touch the electrode to the end of the broken off bolt. After welded cut off the rod long enough to get a pair of vice grips on it and remove. Practice on a scrap bolt and nut a few times first if you have never done this before. Adjust power source accordingly.
I think you may be right about the pulley being new.
The belt looks totally new too.
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