I would like to fourth the start winding, except it won't be the winding but
rather the disconnectin switch, usually centrifigal. Windings don't burn
out, usually and if it was a cpacitor it wouldn't start turning well and
once up to speed it wouldn't make a difference. Make sure you clean off the
WD-40 when you are done loosening it up and lube with a dry lube. Clean
contacts well, They make be pitted beyond function but usually can be
reshaped for a few months more.
Jointer tries to start, partially revs up and then breaks the circuit.