if the metal poles have a groove all the way down the length of the pole you may have a grace ez3. If this is the case you can order new plastic tubeing from their site for around $10. This is used to attach the quilt leaders to the pole instead of using pins, it is pressed into the groove and holds the quilt very straight and square as long as you put it in straight. also you should remember to release the tension on the frame between quilting sessions because if you dont and it takes a while to finish the quilt your quilt could stretch our of shape.