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@Olly398
^ This
As every 1st year Mechanical Engineering student knows. Coulda been worse. Coulda been a 50's airliner. Oh, wait...
Points to manufacturing fault such as a casting void or inclusion, or as someone said a sharp indentation causing a stress-raiser. Then add 300,000 low-stress cycles,...
CasaSteve, doubt there's anything you could have done to foresee/prevent this, but I would deffo try send back to the manufacturer if I were you, to feed back into their Engineering dept and maybe prevent future ocurrences? Or get you a new set of cranks?
Heal up dude.