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What I did was get as much info about the new prop as I could, then took careful measurements of the old one. Any dimensions that are different you'll have to change. On mine is was mostly rubbing I had to deal with which kept the prop from going all the way on. I spent a lot of time with my dremel and prob ate up half as much $$$ in grindstones as the prop cost. To answer your other question yes the hub is pressed in I think. I spun the hub on my Fastwin and then removed the stuck on rubber. I was going to try to McGuiver it using shoe goo and pins, but instead found a very similar prop and went that route instead.

On the McCulloch the hub was not attached and could be removed. I shoe gooed the crap out of it because it was showing signs of giving away. Ran it quite a bit afterwards without issue. My props though are pin driven. With yours I'm thinking the critical part is the cogs. If they don't line up not sure there's much you can do about it. Try contacting some prop shops. Many know where to find obsolete stuff.