<Patrick wrote:....I have a line cutter on my prop shaft.> We too have a shaft razor and I suspect it saved us from a DIW situation between Los Testigos and Grenada when we ran over something that dropped the rpm and shuddered the boat for a few seconds. When we checked it in Grenada we found some very shiny spots on it so we think it did its job. It was a brief wrestling match though as we have a slight leak in the stern fitting to boat area now. We'll check closer on our next haul-out this fall. There is a huge amount of torque when something is trying to stop a prop on a 500 cu in engine turning a 3-1 gear. Drivesavers may or may not be the ticket here. If it shears your dead unless you can close couple the shaft to the gearbox. If it doesn't and takes out the transmission your DIW...yipes the list goes on and on. Maybe we all should just stay ashore and get a pair of VR glasses ;-) Cheers Dave & Nancy Swan Song Roughwater 58 Caribbean Cruise '07