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In this video I show the quickest and least laborious way to change the vertical gear. I say this because changing the gear by moving the upper shaft has less impact on the sewing machine's adjustment. Although it requires almost the entire sewing machine to be disassembled, it mostly involves the machine's fairings. This way, all you have to do is assemble the entire apparatus at the end. Please watch the video until the end, like it, and leave your questions and I will be happy to answer them. Thank you.