I put a UN-72 b/b on a Canondale 2.8 900 frame, then I added a Campy Veloce crank set. The Campy has allen attachment bolts for crank arms.
Problem:
The left crank keeps working loose - I am left leg dominate.
Is there a difference in the tapper of a UN-72 and Campy crank?
Seems as if there is casting flash inside the crank arm bolt hole, should it be smooth front to back?

Thanks, Kevin Smith
Brooklyn, NY