Originally Posted by
Macybaby
...They've both had a lot of years to have wear or other issues to take their toll and affect current performance.
It would be interesting to know if the 15-91 machine improved with cleaning and regreasing of the motor and gears behind the hand wheel. There are lots of parts there that will run smoother after a clean up and tending to, lumpy old grease, wicks and carbon brushes,... The wear points like gears and hinges on these machines usually show very little wear, even on machines that have seen lots of use. It's very often about cleaning, oiling, and more cleaning and oiling as the machine is back in use. Tending to the potted motor feels almost like a partial rebuild, lots of work.