I finally got around to sorting out the Singer 750 Golden Touch & Sew that came with the table in the previous post. It turned out to be in pretty good shape. I had to replace the rubber feed dog as the rubber had turned to a blob over the years, otherwise it only needed a CLA (Cleaning, Lubrication, and Adjustment).
Someone, presumably a so-called technician, had adusted the upper tension setting so it sewed properly at about “1? on the dial. Singer spec’s “4? for most of their machines, but this one has a lot of special stitches that have to have very loose tension. The dial shows zig-zag from 1 to 4, and straight stitches from 6-9). I wound up setting it so it sews evenly with my standard needle and thread at about 6, and so far that seems to work well (I do not have a service manual for the machine). There is a web expert out there that says he always sets upper tension at 2; I think that leaves you SOL if you try to use a very heavy thread.
I have read a lot about the nylon gears in these machines and how bad they are. Only problem I do not see those nylon gears in there, although they may have made several versions of the 750 over the years. The drive gears are metal, the sub-gears are either anoized aluminum or something like Deldrin (a very high tech super durable plastic). The cam stack and related parts does seem to be nylon however.
Also the housing on this machine is alloy, not plastic as sometimes reported. It remains to be seen if the reported timing problems show up. I am beginning to suspect that most of the problems reported about these machices is a case of the service tech not being very knowledgable about them, as they are different in many ways than the earlier machines.
This machine that I only got because it came with the table I wanted, has now become my main machine. The Singer 337 is planned to go to a young lady I know who has lots of kids to sew for.
I am not so lucky all the time. I recently bought a Singer 301 at the local Goodwill store for not too much money.
It had a lot of mold on it as it had apparently been stored for decades in a damp basement or some such place. Unfortunately, the mold had eaten into the paint. OK, so I can not clean it up and sell it, but it did come with a complete set of feet that I can use on the 750, they are both Slant Needle machines. Or did it? Nope, unfortunately, those feet are for commercial high shank machines. I cleaned most of the mold off it, and plugged it in. It does run. I guess I can put it up on eBay for parts or something. It would cost more to restore it than you can buy a minty one for.