I have a Brother sewing machine LS-1217 and was trying to repair a flag for Memorial day. The needle broke and when I replaced it, found that the hook timing was off. The upper thread wasn't knotting with the lower thread. I looked at some YouTube videos (user ejc1210) and lowered the needle bar.
However the lower thread isn't being pulled up at all. Any suggestions?
see: Help! Brother sewing machine hook timing failed part 2 https://youtu.be/qHwy9YazC0Y