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Fred - If you can turn the prop by hand with the engine OFF and in gear, the hub is gone.

While it can be replaced, you should consider investing in a stainless prop. It will be more efficient and you'll get better performance. It will still protect your gear case if you hit a winter stick in the harbor.

If you have a Mercury 90, here are specific props that owners have tested and recommend. There has been extensive testing by Dauntless 16 owners.

Note most recommendations are 4 bladed props since they help get the hull out of the hole and up on plane with less bow rise and holdings plane better. Note engine height. +3 means 3 empty holes above the top bolt.

13-1/4" x 15" Stiletto Bay Pro + 3 holes
13-13/4" x 17" Trophy Plus. +3 holes
14" x 15" Stiletto Star +3 holes
13.25 x 17 Stiletto Advantage 1 +2 holes

You might check with Burr Brothers and see what props from the list they can get you. You can always buy online.