Originally Posted by John_Kunkel
Originally Posted by migsBIG
The second crank has this weird type of machined riddling on the front, something I’ve never seen before


It's called knurling, used to expand/restore the diameter of a shaft that's been worn undersized or otherwise damaged.


I have an NOS 440 crank with the snout knurled from the factory.

Last edited by 71GTX471; 07/13/23 08:37 PM.