I just bought a crank from a guy online, who said it was a 312... It shows up and their are no casting numbers on it. And there is no "aspirin-sized" dot on the outer edge of the crank like you see on Tim's site about identifying the crank:



http://yblockguy.com/yblock_003.htm



Did I just buy a paper weight?

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie