Both the inexpensive Meade DS and Celestron Nexstar GT mounts used Bellevue?washers on their worm assemblies. and wavy?washers elsewhere. Most step motors use one behind the bearing opposite the output shaft. I've got some surplus Tandon steppers made for IBM PC half height 5.25" floppy drives. When was that? In the '80s? Paid $2 a piece, so I don't worry about breaking them up for bearings, washers and fridge magnets.
