The shaft coupler is thru-drilled, no threads. The engine output coupler (where it attaches) has the threads. If the two mating couplers are "rust-welded" together, I fashioned a splitter out of a large C-clamp with a little extra steel and welding.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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