I just bought one of these machines. I found an old mechanic who claimed that he sewed upholstery with it, but it still has the original clutch motor so I don’t see how. I’m trying to convert it to a leather machine by changing out the clutch for a servo and adding a flywheel. This is my first industrial machine and I just wanted to say thanks to everyone for posting vast amounts of information about it. You guys have been very helpful and thanks Uwe for the YouTube video. I totally missed the teeth on the feed dog plate to hold the bobbin case in place. It was driving me crazy and still would be without that video.