finally I got my new 12" astrograph from ASA, where my old OK3Z has been mounted. I never really used that focuser, and am now facing an odd problem: There is some slippage when I reverse directions, to a point that the positions are not repeatable.
I mean: if I focus perfectly at, say, 13.0, then go out of focus to, for example, 12.0, and then run back to 13.0 the image is still way out of focus.
I guess that there are some screws that might need to be tightened, but I found absolutely zero documentation for the focuser (hell, even for the driver it's nowhere to be found). Any hint would be very appreciated