Anyone ever replace the skew arrow touch pad for an HS15+? Frequently I push on an arrow to move the head, and nothing happens. I have opened the cutter up, unfastened the keyboard unit, "delaminated" the plastic cover and moved the "star" metal contacts--helped for awhile but now the problem is back. I can probably get a new touch pad, just wondering if someone has ever replaced one (or figured out how to fix one).