The bracket is that mounts to the motor is part of the starter housing. You cannot rotate the starter unless you get really creative.
Does this answer what you were asking?
Well, I just looked at a spare starter that failed and there is an O ring there where you want to rotate it. My concern would be the wires inside might not want to rotate. I haven't pulled one apart, but I would do some research there and see if its possible. The brush assembly might just rotate around the commutator just fine.
I hope so. Kinda banking on it to make this 650 pjs pipe fit in my 550/650 conversion hull.
Why don't you yes loosen the bolts and rotate the center section there are no wires on it. Just a metal cylinder with magnets inside