I have a Singer 1507 and I took the bottom off to do some oiling and found a plug on the back right of the machine. There is an adjustment screw under it. What is it for?
By L. B.
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It's either for adjusting the bobbin tension (do not try this at home!) or for the timing (another do not try this at home). It depends on where exactly this screw is located on your machine.
Either way, I strongly urge you, as a self-taught vintage Singer repair tech, to not touch that screw for any reason! Because you had to ask what it's for, you don't know what it is or does and if you start playing around with it you may cause yourself to need a visit to the factory trained repair tech for a repair. Which can cost into the three digits if you've done enough damage - so leave that screw alone!
On the bright side, your asking about this screw indicates a beyond-average interest in what makes your sewing machine function - you might consider splashing out on a service manual (ouchie-pricey, for some models the cost runs very close to £800 (over $1000 USD), and teaching yourself to do repairs and refurbs.
You can make some very nice money doing repairs and refurbs, especially on the newer 'vintage' machines (anything older than 10-15 years from the factory).
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