I've been sewing on the same machine for 37 years. Last week the tension (I thought) was all screwed up. I was starting to crumble thinking my beloved Bernina 830 Record was beginning to poop out. Could not figure out what was wrong. Took the bobbin out, cleaned and oiled her, put bobbin back in. Sewed. Same thing. I was just getting up to call the dealer when I thought I'd check just one more time....sure enough-bobbin in backwards. I was so happy! Then I started to worry about myself....