New from MMB is watertight shaft assemblies for model submarines.. These have been extensively tested in our sub-sonic and are watertight.
They come with a cast resin mount for your motor, pre assembled and greased shaft with sealing O-ring and a solid coupling made to order for the shaft of your motor. Only assembly required is drilling the mount for your size of motor, bolting the whole lot together and glueing the stub shaft in.
Currently available in two sizes, the 400 size mount is priced at £10 and the 540 size at £12, both plus p&p
Also available are pushrod seals, stainless steel outer, for 2mm rod complete with tiny O-ring to seal. 1.5 inches long. Just grease and fit... £3 each plus p&p
Both now available from http://www.marksmodelbits.com