The machine is working right except that sometimes it will creep in reverse (forks direction) on its own. Barely twisting it back the other way stops it. I wanted to try recalibrating it but I don't have the procedure for this card (or a good description). All the markings are covered with a thick grey rubber insulation. I carefully scraped some away and the jumpers looked like they were marked: P|T|D|C (if I remember correctly). I have a new one in my van (from my stock) but it's kinda useless since I can't calibrate that one either. Yup, I tried lol.