I would just buy new cranks to be honest. Pedal taps are pricey, you could get a decent replacement for less cost.
Or try paint stripper if it’s only paint in the threads.
For the off kilter cranks, are the cotter pins in correctly/right way round?
Pedal taps are pricey, you could get a decent replacement for less cost. should cost you no more than £20 and you’ll wonder why you didn’t buy a set sooner.
FTFY.
@M_V started
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I would just buy new cranks to be honest. Pedal taps are pricey, you could get a decent replacement for less cost.
Or try paint stripper if it’s only paint in the threads.
For the off kilter cranks, are the cotter pins in correctly/right way round?