Originally Posted by
DannoXYZ
Yeah, there's absolutely zero way the soft aluminium crankarm can damage hardened steel on the spindle. That crank is toasted.
I have seen it happen... the rider continues tightening and riding and retightening for a long time and the crank 'polishes' the edges of the spindle just enough to make a correct fit with a new crankarm impossible. It is rare but it happens.