RE: Spinner question
Maybe I have read this incorrecly, but it sounds like you are assembling the pieces in the wrong order. Remove everything from the crankshaft except the thrust washer. Put the back plate that came with the spinner on first, seated against the thrust washer. Slide your prop on next, followed by the prop washer, then whatever nut or nuts came with the engine. Not sure how your particular spinner attaches to the back plate, but if you do the above, aligning the prop to accept the spinner and attaching the spinner to the back plate will be apparent.