I have recently purchased a 29k58. Upon trying to sew with it I found that no matter where I adjust the stitch length bar it doesn't change and is very tight stitching when you operate it the way it's supposed to by turning the wheel to you. However if you turn the wheel clockwise, ( I know your not supposed to) it will make a perfect stitch and you can adjust the length by the adjustment mechanism, however the material is going backwards. Any ideas?