How I Clean & Adjust a Singer Class 66 Bobbin Case, like this Model 327K

Dirty, damaged or out of adjustment bobbin cases can be cleaned and adjust. Two tiny screws and a tension spring. Lint, smudge, and oil can build up behind that spring and cause tension problems. Do it yourself. 1 OUNCE TENSION ON BOBBIN SPRING Models using this case are 66, 99, 401A, 403A, 404, 500A, 503A, Singer 400 models, Singer 500 models, and many others 00:00 INTRO 04:30 BOBBIN TENSION THEORY 07:00 DISASSEMBLE 12:00 CLEAN 15:10 ASSEMBLE 21:00 ADJUST TENSOMETER: https://singer-featherweight.com/coll... MUSIC: BENSOUND " ENERGY"