Hi, I'd like to get my Space Echo working properly. At the moment, the tape speed is too variable and it too often gets stuck. I had it serviced when I bought it 6 months ago - but the speed has always been a bit off. I've recently put new tape in- and it ran well for a couple of hours. I've tried lubricating the motor with WD40, and gently sanding the pinch roller (and cleaning the residue off...). How do I tell whether the felt pads are too old? How can I verify if the pinch wheel is set to the correct tightness? What else should I be doing?