change the needle --make sure it's the right one for the fabricbeing sewedrethread the machine top and bobbinmake sure the bobbin is turned the right way in the bobbin casealso check the top thread tension, if the stitches under the fabricare loose adjust the top thread tension one number or letter higherat a time and sew on a scrap piece of fabric till the stitches look normalhere is a free manualhttp://www.singerco.com/uploads/download/696_5417c.pdf
You will need a blind stitch foot. I believe that your machine requires a short shank foot. If you already have the foot, you can refer to the Singer sewing book for step by step or go to YouTube for a video of the process (the video uses a different machine but the process is the same) :
Why not go to www.singerco.com and download a free manual? You can save it to your computer and enlarge the diagrams for easy viewing. Plus you can print it, if you wish.
More than likely it is your top threading. Insert new needle, (flat side facing away from you), totally rethread. Now with presser foot up, pull top thread it should feed easily, now put the presser foot down, the thread should hardly move. This should seat the thread in the tension discs. Hopefully, that is not your timing. You can download a free copy of your manual at www.singerco.com and save it on your computer, then enlarge the diagrams to see everything easily.
The best thing to do is thoroughly clean the machine and oil it. Take off the throat plate and make sure that there is no lint hiding underneath. I got fooled once, years ago, I thought it was felt that came with the machine, guess what, there was no felt that came with the machine, it was lint packed up so tight that it looked that way. If, I hadn't taken off the throat plate, I would never have seen it and thought that I cleaned it right. Try this and I hope that it helps.
The bobbin case is truly faulty and needs replacement.
To know where the broken needle fell into, suspend a magnet to where you suspected the needle to have fallen, if it is there, the magnet would pick up the broken needle if it is still in the case.
If the needle is not in all the way it will bottom out in the shuttle, or if you bought new needles and accedently got the wrong ones. If the needle does not enter the needle plate far enough to be bottoming out then the machine is out of time. You know i was about to hit post it and I realized I didn't think about, if the needle is bent it will hit the hook. so check those things hope it works out.
I just had this problem, too - if you have the manual, check out page 15. If you have removed the throat plate, you need to make sure that the position finger on the bobbin case base enters a notch on the underside of the throat plate. Fixed my problem right away.
If it is damaged from turning out of place once, it could have rough spots on it that makes the thread hang on it, and keeps making it turn over and over. Use a finger nail board (fine sanding) and smoothall rough spots. Then reset the bobbin case taking care to put the notch in the bobbin case in alignment with the proper spot in the machine (basically 5 o’clock) when looking at the round area where the bobbin case goes.
Question edited for clarity.
Do you mean the embroidery unit. If it is secondhand and has been stored for a long time, sewing machine oil, or worse WD40 goes 'gummy'. You would need to clean all the out. WD40 is a good solvent, so spray, leave it to soak, spray again and agitate with a brush. The wash it all off with hot soapy water. Dry thoroughly and after a few days, lubricate metal parts with sewing machine oil and any plastic parts with a dry silicone spray like Jigaloo. Test Jigaloo on a flat piece of plastic first as it is also a powerful fast drying solvent.
DON'T cut lumps out of your machine. There will be a sequence you use to remove the parts you need to access to the gears more easily. The Youtuber you referred to sounds like they have zero knowledge when it comes to these older style machines.
'Note' Some of the gear mount nuts are on a "Reverse" thread meaning you turn them the 'wrong' way to get them off.
My limited knowledge is more on the much older hand crank and treadle machines.
Try the Youtube link below for a channel called 'Andy Tube'. He has a good reputation for correct repair methods. The link is for a 758 but they're both Touch and Sew machines.
You could also try the Facebook group 'Vintage Singer Sewing Machines' as they have loads of knowledge about loads of different machines.
https://www.youtube.com/watch?v=zxd5hKjGBlE
