:lecture:
I always thought BFH was a Beemer Fixing Hammer (DIE YUPPIE SCUM!!)
Had the same problem with my hack-n-tap, took a small stone to take the edge off the inside of each valley. After that, it just slipped on. Dunno what tool you used, I used a 4 1/2" grinder with a cut-off wheel. Just left the motor running, trans in reverse. Marked the cut with a piece of masking tape and let the Mark-One eyeball do it's thing.
25K later and it still works well.