Tensio question
My sewing machine has given me a fit all weekend. I am getting loops on the bottom of my project. I have tried to rewind bobbin, thread machine over, bought new thread and changed needle. I am using size 14 needle and sewing 100 % cotton (4 layers). I Tried to adjust the tension to a higher number and then to a lower one. I managed to get it better but still not right. I am hoping someone here can tell me what else to do/check. It is a Brother SQ9500. While it is an inexpensive machine, I have pieced many tops and quilted 9 quilts on it and I love it.