Please look at the two photos of my 58 rude 10 hp, I'm pointing at a slot in the magneto base, as you can see by the position of the flywheel key between the 2 photos the base moves, my question is does this slot serve a purpose and does it line up with something? I think I can mount the magneto plate with the slot forward or to the rear? sorry I know this is not very clear, but I hope you can get what I'm asking Thanks.