Unscrew the wheel. It is threaded onto a "retainer". Check for thin shims as you remove it so they go back correctly. ALSO, if you take off more than one dial, mark them to go back on the same shaft. I found that the inside depth is different on some than the others. I didn't discover this until AFTER I had removed all of them to clean!!I need to remove the number wheel (dial) from the knee feed to polish it, numbers hard to read now. What do I need to do after I slide the handle off the shaft?