I'm Using the ofna true start 12v motor 12v gel cell, Blue box w/ chrome top and mine lined up ok. didn't have to chamfer the wheel at all but I also seem to be the only one that can use it. I had to run down off the stand to start my car for my pit guy and five other guys that were trying to help him.

Despite all the pins being set tight and well aligned I still have to push the the buggy up to the front and make sure it is well settled before it catches the flywheel just right.

I've heard of others opening the flywheel slot by grinding at it, but I don't think I could stand to do that to my buggy.