Has anyone replaced the seals on one of these...the large case o rings & the two shaft seals. Just wondering the difficulty level of this and what to expect. My boat has been sitting for 10 yrs. ..inside my shop....I've finished going over the engine (150 Evinrude ) with new hoses, Carb kits, lower unit seals ,water pump etc.. I found seals there that looked like they were ready to fail so now I'm thinking maybe the trolling motor should get some attention also...or just leave it as is....any thoughts on this ? I hate to ruin a good TM if water leaks in. 1990 Javelin 396 , OMC OBFL4A 24v trolling motor. Thanks