I have a question concerning the Free treadle machine I tried to sew with for the first time today. It wants to skip stitches every 2 or 3 inches as I sew along. The tension seems good and I have checked the needle to be sure it is inserted correctly, and it seems like it is, but I am looking for any help you might have. I have exhausted my information from the manual and can't see any help there. I have a new needle in and am sewing with 2 pieces of cotton.