RE: Nelson 40 Help
If your crankshaft is 19mm in diameter I believe you assemble the balls directly on the crankshaft along with the outer race of the bearing. I think you need a 30X17X7mm bearing then pop out the retainer, assemble the balls on the crank along with outer race, then pop the retainer back in, then install the crank with bearing in the case. Not completely sure because the pictures of your motor are blurred, hope I've helped.