If its like mine an old SB30-AA model the shaft is retained into the bottom
of the housing by a circular plastic bush behind where the cutter/impeller
mounts. Its a push-click fit. A rounded shoulder clicks in the retain the
bush. There was some RTV or similar to seal it. The metal shaft will slide
right out when the bush is removed. Has your bottom bearing bush gone tight?
The shaft is tight .
behind the impeller there appears to be a metal sintered bearing
it looks like the flange has to be removed from outer shaft cover tube
but I dont know if it is threaded or shrink fit
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