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Hi everyone! I believe the phrase "long time listener, first time caller" is apt here even if we are not on a radio station. I'm a general maker but mainly I'm a leatherworker. I make a plethora of things from wallets to hats. I recently acquired a Sieck 269-373 sewing machine, which I can only assume is a Chinese copy of the Durkopp Adler with the same numbering. So it is fair to say I am new to the august club of sewing machine owners. I have had problems even finding a good manual for the machine so I'm not even sure it's threaded correctly. I have included pictures which show the threading. I am also significantly confused over what thread size this machine can handle. Wherever I look I see different opinions on this matter but as of right now it is (hopefully incorrectly which might make for an easy fix) threaded with TEX 135 bonded Nylon both above and below. I have included pictures of the threading for reference. My problem is mainly the tensioning. I don't know if this is because the thread is too thick or because of a setting. I have tried cranking the tension right up but I get the bobbin thread basically sitting flush and not being pulled into the leather at all. I've included a picture of a flipped over piece of 5 oz veg tan that I tried to put a seam in. I now ask for your help to see if anything stand out as wrong or any ideas that pop up. And please, do not think that anything might be too stupid for me to have done as I am a complete novice with this machine. Thank you.

Selling a used Durkopp Adler 269-373. Comes with binder attachment and new servo motor and speed reducer installed. I’ve had this machine for a few years, but haven’t really been able to use it as I would like. Bob from Toledo Sewing serviced it last summer, but it has been mostly sitting idle since. Asking $1000, would need to pick up from Columbus, OH