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UPDATE (if anyone is interested in) I bought the bobbin lock code 210764 from China. The sewing machine works better. Maybe a defective item from Singer ? I am going to engine it. Regards.

Hello, well... the timing (as anticipated) is and was correct. After polished the rotary hook and the bobbin nail lock things got better, the thread slips correctly. BUT there are some other thinking I would like to share. Speed is low, if I get faster i broke the thread. It seems do not accept (like) thick thread, it breaks. The major guilty is the nail that lock the bobbin, it seems to be difficult to pass it... I ordered another one, let's will see. Any suggestions ? Thank you.

Who is Constabulary ? A friend of mine. Thank you

Hello all, I own a 307G2 and a 491. Well about the 491 it is perfect, I found a service manual and the timing is right. But... I am not able to time the 307G2; I bought it already not working and the rotary hook keep the thread so it get 2 or 3 round then It broke. Please anyone can help me ? I read that it is a really good machine but not for me... I found the timing mark on needle bar and revised the cardan. I am able to rset the rotary hook time but I don't know what is the right timing. Many thanks to anyone that can help me and any help will be apreciated. Michele