I don't have a 600E but I did buy a 646 - knew it had problems but ended up it will not sew. It runs quite well but doesn't pick up the thread and nothing in the bobbin area moves. Mine has plastic gears and some of the gears are messed up. "Touch and Throw" seems to be a very common name for them. I'm going to sell mine for parts and maybe get back part of my money. Hope you have good luck with yours.





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