So I have to FW's, one is 1950-51, the other 1955-56, and a 301. I haven't spent more than $10 on the worst FW, everything from motor to presser foot, to bobbin winder was stuck, hard. But now, it actually stitches, a wee bit of non FW-like clatter, a little play in the gears I think. But I like the fact that she could be used by someone, without being paranoid about damaging something. I would like to get her working as well as possible though. To this end, I need to replace badly rusted tension disks. I'd also like to have at least one, really nice bobbin case/hook assy.
So when I look at Ebay and various vendor sites, they show vintage Simanco parts as well as new repros that aren't generally thought highly of. I notice my 3 machines have 3 different bobbin variations.
The one on the left, from 301, is marked Simanco USA 45750, has slanted face below latch.
The mid one, from '50 FW is marked Simanco USA 45750, on a squared face below latch.
The third one, from '55 FW is only marked Japan, inverted above latch, with a slanted face below latch.
The third one also has tighter clearances where the thread is pulled down through tension leaf spring.
They all seem to work fine, but I haven't pushed them through any large projects yet, just testing.
The hook assys on the FW's both required quite a bit of polishing and rust removal.
The question is, what are the shortcomings of the reproduction parts? Is the one marked Japan an early repro or could it be a part from a late FW that weren't marked? Are all repro parts presently sold, of questionable quality?