Also not using belts that are excessively worn is key to maintaining the temper of your knives. I’ve used a Delta 1x42 sander for so many tasks in my workshop and it does an excellent job on knives. I need to buy some new belts though. The ones I used up over the years were from Lee Valley. Anyone have a good source of good quality belts? The 80 grit ones from Lowes or HD are not a good choice.