The bow thruster of CottonBay was never sealed ;
This is certainly not the best from AMEL....
I put in the photo section a few pictures to illustrate the problems and photos to illustrate how I repaired
1 - output shaft of the electrical drive : broken
2 - support ring of the propeller deformed after 6 months of navigation => how I repeared it
3 - inner gear pin : broken
4 - Cover: not waterproof
5 - propeller oil seal : not waterproof => how I repeared it