Thanks for the replies
I'm a commercial skipper/project manager myself so I can understand about owners and costs! "I'd really like you to remove the fuel tank and clean it before I take your boat anywhere else!!" but thats another story.
The Technology I'm thinking of is one thats been developed by a friend in Perth, Richard Caulfield, that is now proven on commercial vessels. But hes a small business and the marine business is spread far and wide. The two systems he's patented, effectively create a maintenance free stern gear set up. OK I know thats impossible lets say extremely low maintenance, especially if you operate in shallow sandy/silt laden waters. Its called SandStopper™ and QuicKutter™
and cost wise its not actually very expensive compared to a dry dock or lift.
One owner I've worked for (hes and engineer) saw it and said yes what a great idea! He should get them fitted on the the next lift work schedule.