Which cooks scant?, I've got a set of F Cranks and they're still going nice and strong had em years and had loads of abuse, although I have t admit as much as I batter them riding wise I am very cautious about keeping my feet away from the crank arms to stop the black rubbing off.
I never rode F cranks, they were forged right? so hopefully considerably stronger! RSRs & E cranks I killed. tapers on the RSRs & mounting prongs for the spider on the E cranks.
WTD- Shimano M980 XTR Rear Derailleur