As I heard quoted here before, its a precision thread injector......
All jokes aside, it's not that hard. I found a 111g156 for 500$. It's a walking foot industrial machine made in the 40s. The best manual I found was actually an army and navy field manual. Apparently this type of machine was commonly used to repair tents and sails in wwii.
I would highly suggest getting a machine with reverse. Rotating your work to lock a stitch might not be possible depending on what you are working on.
So far I haven't found anything that will fit under the foot of my machine that it won't punch a hole through. And it has a 1/2" clearance. I tried it with 1/2" of knife sheath leather and it went through like butter.
Now just like everything I buy, I made some modifications. Perhaps that's why I like saddle hunting so much
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I changed out the motor and the drive pulleys because the machine was way too fast for me to do precision work. And I am working on building a new table with a cutting material top so I can use my rolling cutter on the same table.
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