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In-line connection, 330 style: make the shaft extra-long by an inch or so, and turn that inch or so down to about the same diameter as the pot shaft. Put the ends of the shafts together in line, then put surgical tubing around the small portion and ziptie it down solidly. That way, even if something goes really wrong, the pot (or encoder) isn't going to be too banged up (it has its own mounting point off the axle).
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Team 691 has done the same thing for awhile. We however create a flat on the end of the shaft so that the surgical tubing holds on better. We used this to attach encoders to a ~900 RPM shaft and had no issues.