I was cleaning my 72 Paramount, the one that has the $5 bike swap meet Campy NR crank spider. I noticed what appeared to be a crack on both sides where the crank arm blends into the spider. I know these are famous (or rather infamous) for this, and I recall reading somewhere if they are not too deep they can be filed or ground out to eliminate the stress of the tearing aluminum.

This particular crank set may be too far gone, but I have another with a miniscule crack. I think that one is still salvageable, but am definitely interested in hearing from those with more knowledge and experience than I have.

Remember, the crank pictured is the worst one. The first photo is viewed from the outside, the second from the inside.

As always, thanks in advance for your advice!