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Nesting is usually a problem with threading the machine. If you have the handbook, try checking the right way to thread it. I have an old car that I love, but it is harder to get parts for it now. Sometimes you just have to trade in the old for the new...not that I'm giving up my car any time soon!
This Singer model is one of the machines I saw, when I wanted to buy a new machine, about 20 years ago. It is a very old machine and the lady you have talked to, was right in telling you that it's an old machine and no spare parts are to be found. I wish you luck with this machine but I would buy a more modern machine for the embroidery. Also, search the internet for advise about the bird nesting.
Forgot: Welcome to Cute Embroidery!
Hi and welcome to Cute. Not sur e which part of the world your in. Embroidery machines are specialised and therefore specialised (trained) mechanics are required to work on them. Sometimes our machines can be highly temperamental. I have Brother machines and am very fortunate to have a great dealer but sadly that isn't the case for many. I travel three hours each way. Not sure if your 400 is £$ ¥$ £ but for the UK that sounds reasonable. Is there a Facebook page for the Singer Quantum that you have? Do you have a handbook that goes with the machine? Your problem may be simple to sort and maybe not. Please let us know how you get on and keep asking questions. One last question do you know where your grandmother bought the machine? If you are able to find out go back to them. asterixsew in the UK
Welcome to Cute.
When I searched your machine a place for parts was listed. I am giving you a link for it. I do not know what part you are looking for and where in the world you live. Hopefully this helps.