Motor of trident

My name is Reinaldo Briones,
how do you remove the shaft from the Trident engines? I want to clean that part.
Also could you tell me the dimensions of the bearings you use?
After two dives and a month without use, the engines were stuck rusty inside. I managed to clean them and now they rotate but the bearings are not smooth.
I had thought about changing them for Teflon bushings, would it be possible?
But I don’t want to disassemble them without knowing the measurements and buying the spare parts.

Reinaldo from Easter Island