If it's only 1 or 2 threads you might be alright for a bit. If it was me I'd replace the crank arm in the near future still
I was planning to slap some Dura Ace cranks I've got on there in spring/summer anyway. Hoping these will tide me over until then! It's not like I'm straying too far from home at the moment... Thanks everyone for the advice.
@ltc started
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If it's only 1 or 2 threads you might be alright for a bit. If it was me I'd replace the crank arm in the near future still