Johnny5

Thanks @kggI will try getting some new bobbins and see if that helps, the ones I am using came with the machine when i bought it. The bobbin case is for sure loaded correctly loaded. I did replace it with a new one and also replaced the tension assembly when I got the machine less than a year ago (This machine is over 40 years old).

Thanks @Gump I have tried a size 20 needle as well with the same results, but I am using sharp point needles. Will the round points help?

Pulling my hair out, hoping some industrial machine veterans can help. I am struggling to get consistent thread tension on my Consew 206RB. I am working in upholstery vinyl (Naugahyde) and will test the tension using the same vinyl I am am using for my project and doubling it up. I dial in the tension until it is perfectly even on both sides on my test strip. Inevitably when my project is done and I turn it over, the bottom tension has become greater than the top and thread is pulling through, never the other way around. I've tried adjusting the bobbin case tension but that doesn't seem to make a difference. I've tried different needle sizes (currently using a size 18 needle with #92 thread) with no difference. Wondering if my bobbing winder is the problem? It struggles to make even bobbins regardless of the tweaks to the disk tension and angles of the thread. Unsure what adjustments to make, any suggestions would be much appreciated.