Dale, I can't help with the Johnston replacement, but have you looked into getting yours rebuilt. I had one of mine rebuilt new shaft, seals
, bearings etc for much, much less than a new one. Used one of our local engineering / diesel
mechanics. Had to buy shaft from Yanmar though.
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Seabreeze, Lagoon 380 #241
Innisfail, North Queensland, Australia ... Cruising the waters of the Great Barrier Reef