Did you watch the rerun of Simply Quilts yesterday? Alex had on a lady who spoke about adjusting the bobbin screw. Her riddle to remember which way to turn the screw: "righty - tighty; lefty - loosely". She only turned the screw 5 minutes.
Her information is on HGTV for June 24 if you want to check it out. She was doing bobbin embroidery. I wasn't much interested until she started talking about bobbins.
Suzanne