For about 45 dollars you can enroll yourself at the Huot vocational night school that's attached to Laconia High School, and learn diesel mechanics and epoxy paint application technique, and do-it-yourself. For more advanced training try the Marine Technician, one or two year course, at NH Technical Institute, Laconia, that is well-endowed by Mercury Outboards and MerCruiser engines. And then, on the way back to Wolfeboro, stop at the Wal-Mart for a $2.25 quart of lower unit, gear grease. What the heck, grease is grease, no need for that fancy synthetic stuff.
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The Y-Landing Marina, tucked away behind Pine Island, definately sells diesel fuel, as well as premium high-test gasoline, milk, beer, newspapers, bread, and now has a small retail boating store with items like bilge pumps, replacment rubber foot-steps, bowlines, cleats, bow eyes, air horns, etc. And, since they work on the diesel engine of the MV Bear, they have some diesel experience, and are the only factory authorized, Suzuki outboard dealer on the lake. Y-Landing is one of the best outboard repair marinas on the lake for Mercury outboards too, imho.