What do you mean by Jam? Is it the thread that is jamming or the needle won’t pierce the fabric or what? If it is the thread that is jamming it could be you are starting with the needle not all the way through the rotation. It will jam every single time. The needle has to be up and the bobbin thread has to clear the hole. If the needle wont pierce you may need a larger needle. The largest would be an 18. These machines are really not all that heavy duty. If you do have the wrong bobbin it will do funny things. A class 66 doesn’t have a lot of holes. It is curved. You can buy them in a lot of places. Some are good and some not so good.
Last edited by QuiltnNan; 03-02-2019 at 01:39 AM.
Reason: shouting/all caps