Just bought a walking foot for my pennycrest 3000 machine. Made sure the arm is over the needle screw and was working . Started breaking thread after few stitches. Now breaking needles after 2or3 stitches. Used whole package of needles. The needle is hitting the edge of the walking foot. Does the w foot shift when using to quilt a large quilt? What are the tips for this w foot? Thanks for help, Jeanne