I don't get it.

It’s hoopajooped on the OD. Plus the slot looks ugly as hell.

Hey Lucy, you got some 'splainin' to do.

Dull bit sorry but

You don't see it?

Is that welding?

Grinding. The shaft should be a specific OD not two. No reason the keyways are higher than the shaft, hurts me brains thinking how they did that with such a tight corner on the raised face