I think I might have messed up my Campy Athena (1997) square taper bottom crank (left crankarm) by riding on it while loose. I'd didn't ride the bike much and didn't have the 8mm allen wrench with me to test the tightness, so I just rode without checking. Lesson learned. I know have the 8mm hex wrench and the left crankarm will tighten down and not seem to move, but after maybe 30 miles of riding needs to be tightened some more. Hmm.. So, the crankarm is probably damaged, but I'm not sure if the bottom bracket taper has also been damaged. From what I've read on here, it seems like people are saying that it's not likely because it is steel and the crankarm is aluminum. We'll see. I ordered a new (used) crankarm and will see how that works. And whether or not it stays tight.