Originally Posted by
thehugoball
Uh, whoa.
I will take a closer look at the crank. Thank you. FWIW, I rode this crank for many years and was saving it for building up a classic Italian show-bike someday. I'm glad that I never thought to sell it or I wouldn't be able to live with myself if I gave someone a component that might fail and injure them. Maybe I will hang the crank on the wall and admire its beauty instead.
Well, you could then get matching date codes then. The drive side arm is quite beat up on the back side. File the crack, what we see is the black line at the junction of one of the spider arms and the crank arm. File it, and dress it smooth. That is why I suggested a chainsaw file as they are quite fine cutting. These cracks don't cause catastrophic failure, they can render the part a paper weight, if its failure you are worried about the gouges on the back of the arm are the stress risers.