Someone please help before I put this sewing machine through the window!!!?
Im using an old Lotus SP, and it works great most of the time, however it takes notions sometimes (today being one of them) and I really can’t work out what im doing wrong. It was working fine until the bobbin ran out of thread, i changed it, then basically what has been happening since is my top thread is getting caught around the mechanism that rotates around the bobbin. For about 3 stitches its fine, then instead of slipping around the bobbin mechanism it gets caught. The machine wont go forward anymore, and ends in a big knot on the fabric. What am i doing wrong? Sorry im not a very experienced sewer, so i hope someone can make sense of what I have tried to explain and can help before i go crazy lol. Many thanks and best wishes 
