soul05,

Looks like other people have posted a lot of good info about the Lambert bikes.

FWIW, the original spindle was square, but not tapered. Eventually, the crankarms started clicking regardless of how much you tightened the bolt. So I replaced the Lambert spindle with a Phil Wood spindle. Then I took a file and tapered the inside of the crankarms to fit the new spindle. It wasn't great, but it worked OK. I wouldn't recommend that, though. BTW, you'd have the same problem with a Klein spindle.

Steve