Any product will be ruined by incompetence.
When tightening bolts and pedals, go slow and don't use excessive
strength. If you have to use force to get anywhere, chances are that
something is wrong and you should stop. Use quality tools and fresh
Allen keys.
Maintain your cranks by checking for looseness before every ride and
grease them occasionally.
There is no excuse (besides having a defect) to ruin a crank. Some are
more susceptible, so be more careful.
To answer your question, moments will strip easily in the care of a
moron who cross threads, etc. They will last ages for someone who knows
his stuff.
--
Danni
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