Unfortunately i can't offer any help, but i do have a similar problem. I have an Enya .49X with a prop shaft so short that if i put a spinner backplate behind the prop, the nut won't even completely thread onto the shaft. Recently i switched to a different prop, which happened to be thicker in the center, and there's no way the nut would go on, i had to take my spinner off. Now i can't use my starter and the plane obviously doesn't look as good.

Be sure to make a post here if you find a good solution to your problem wsmalley.