I'm not into industrial machines, so not much help. According to
http://ismacs.net/singer_sewing_mach...sses-1-99.html it is a high speed industrial machine with a rotary hook.
There is a manual at
https://web.archive.org/web/20160910...uals/95-10.pdf which has instructions for use and also adjusters (starting on page 10 of the pdf). If the link doesn't work you can start at
https://web.archive.org/web/20190820...IPinstManuals/ and click on
95-10.pdf
I also noted that it uses a 88x1 needle. Since it is a round shank needle, it can be fiddly to place properly. From my understanding if it is a little off, it can cause problems. I think I used a Kenmore needle threader to insert the needle in my Junker and Ruh machine.
Janey - Neat people never make the exciting discoveries I do.
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