Mid-arm quilting novice here, although I've sewn and quilted most of my life. I just bought the Pfaff Hobby Grand Quilter with the Inspira frame from someone who used it once and decided they didn't like it. I haven't plugged it in yet to see if I'm any good at it. I need to solve a small problem first. The shelf for the pantograph sheets dips down in the middle (I've got it extended to it's full size.) Is there some way to reinforce this shelf in the middle so it doesn't dip?