I don't need one, but have had them in the past.
Problem #1 is a loose allen set screw on the shaft.
Problem #2 is in partlikely just thickening lube on the clockwork mechanism. A touch of solvent should clear that up.
A spritz of De-oxit may help with the flaky enlarger power contact. They can arc, and present a poor contact over time, particulary if the enlarger it fed had a voltage regulator between the enlarger and the timer. There are lapping papers available that work to clear up contact pitting. It is a delicate kind of a fix.