I called tech support and as usual, they were very helpful. The knobs are indeed supposed to lock the elevation and bevel wheels. The fix is easy, but I haven’t had time to do it yet.

Remove the hand wheel and washer. Drive out the roll pin. Install a fender washer onto the end of the shaft and reassemble.

Having never owned a table saw before, and this being an older saw, I don’t yet know all of the fine details of how they work, or what might be worn out and not working correctly. The manual says nothing of locking the hand wheels with the knobs.

Where are the band-aids?---Pro Libertate!