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[Saltair Boating]

So I have a Consew 1206RB. I bought the machine and it was like 6 months old and like new. The owner showed me how it worked. At the time he was using cardboard pre wound bobbins and it all looked good. When I got home I bought some bobbins and they ended up being the pre wound ones that don't have a case. I found they didn't work right. Wacky stitching. New to sewing it took me long to realize it was the bobbin. Then I went and bought the pre wound ones WITH the cardboard case. Now I was really frustrated, because my stitches would look good for a wile then screw up. In the end I used the metal ones that came with the machine and wound them myself. Big difference.. The thread pulled out of the case smooth and stitches were much better. What is the deal with the Cardboard ones. I ended up buying like 72 and cant use them unless I'm missing something. Thanks

[LLeeT]

It would take a bit of time, but you could rewind them onto the metal spools. Should only take less than a minute for each. I have never tried cardboard spools, but it seems like an added cost.

[Adam12]

You have a spring in the bobbin case to control backlash. Bobbins without the cardboard could easily hang up on that spring. The cardboard eliminates that but if perhaps it is the wrong size bobbin, you'll get slop in the bobbin case which could potentially cause an issue. Bobbin tension is different with pre wounds, they are wound tighter and thread won't just fall off as it would if you wound them yourself. So bobbin tension would change going from one to the other. Just throwing up some ideas