Okay, I thought we had the tension problem fixed on my Singer 201-2, but it acting up again. I sewed with it all afternoon with no problems, changed the bobbin twice. After the second bobbin change, I again had the top tread sitting on the top of the fabric. After re-treading both upper and bobbin 3 times, we fiddled again with the bobbin tension screw. Got it okay again, sewed two blocks, and now it sews three perfect stitches, then sews four stitches laying on top. How do I fix this.
I have checked the bobbins, and I am using the older ones, and I checked for warpness. What am I missing.