Centa drives are a popular choice and maintain a good reputation in the canal boat world I'm familiar with. Typically fitted between gearbox output and propshaft, they can absorb minor shaft misalignment as well as shock loads.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone