Here are a couple of copies of manuals for the W&W curved needle machines from different?points in time. Both show how to set the needle & place the bobbin in the correct orientation & to thread the machine. Do note the way the upper tension?works on a W&W it is an absolute necessity to take that turn around the tension wheel. The tensin wheel must rotate to provide the upper tension.
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I am not familiar with your German-made machine but if it is indeed from around 1880? it may be more like the needlebar manual whether low or high bed. The basics of both are the same, with some minor differences from different time frames.
The two-hole (Fig 8) insert is the braiding foot, the standard insert has only one hole. From memory,?I believe the bottom of the braiding foot will work for ordinary seaming without the braid.?
Hopefully, your machine is a near enough?copy these manuals will be useful to you. If you have further questions feel free to ask.?