I have an industrial 20U33 that I like to sew on. It is smooth, strong, and quiet and makes a perfect stitch. It also has a 9mm zig zag, which I rarely take advantage of but I know it's there if I need a wide zig zag.
I have had it mounted in a power stand from a Singer 95-10 that went away years ago.
I like the table because of its solid wood top that I intend to refinish some day and the flip-up leaf that extends the sewing surface. Problem is, the ancient clutch motor has four wires protruding from it and I can find no documentation how to hook up the wires to make the motor operational.
To substitute for the missing clutch motor, I installed my largest family machine motor - a 1.3 amp model from a White.
The treadle did not allow the foot control to be positioned in a comfortable location so I wedged it under the far end of the treadle and depress the treadle to actuate the speed control, just like I would if the clutch motor were working.
This setup allowed me to sew but there was no light. I tried a stick-on LED light but it did not provide adequate illumination in the proper direction.
A tabletop Ott Lite provided illumination but I was constantly knocking it over.
To the rescue was a Singer 252
with a broken plastic gear in the upper section.
I was able to find a replacement gear but see no way to replace it without removing the main shaft - a task I do not wish to undertake - so it is now a parts donor.
The first donation was the foot control, motor and attached light. They fit perfectly on the 20U33 and I now have a machine I like to use with enough light to see what I'm doing.