last fall I took off my crummy 4 blade Cutter prop for repairs and recently decided to get a 515 Acme. It's been so long since it took off the old one, is it possible for me to put on the new propeller wrong? I remember removing a key as well as a little piece of wadding underneath everything. Any pointers would be helpful. It's good to be back on the forum and in the water as soon as the prop goes on!