Here, I have the mount-head attached to the tripod's hub, thereby to the tripod itself, with the DEC-axis upside-down, and to determine what to do about the DEC setting-circle assembly...
The original washers for the DEC setting-circle...
...history.
For replacements, I chose the thinner, 0.008" thick bronze...
The rotation is much improved.
I know, and you probably know, too, that the setting-circles for this mount-head, and many others, are next to useless, or utterly useless...
Still, if I ever have a mind to attempt to use them to try to find something, then I want them in good order.