I have sailed many thousands of miles with the shaft locked using “Chain Vise Grips” Chain Vise grips, use a 18” motor cycle type of chain and cost about $35. The chain Vise Grips have all sorts of uses around the boat—especially when a strap wrench will not do the job! There are cheap imitation—but as usual one gets what he pays for. Example: https://www.lowes.com/pd/IRWIN-Vise-Grip-Chain-Clamp-Locking-Pliers/50431790 <https://www.lowes.com/pd/IRWIN-Vise-Grip-Chain-Clamp-Locking-Pliers/50431790> I had a block of 2/4 for the Vise Grip handle to rest upon. A lot depends on the configuration of the hull, if this short handle will do the job, It did in sail boats 46 to 62 feet long. However, the prop was only a 3 blade 24” diameter. I wonder what type of vice, one is stopping? Probably one of the most often misspelled tools! Regards, Bob Austin Pensacola, FL.