I've purchased a Celestron Focuser (
https://www.celestron.com/products/focus-motor). Did some review on installations and potential problems, thought I'd ask here.
When I remove the rubber knob off of the OTA, I noticed that the travel focus rod only has a Philip head screw on the end with no washer. I was curious as to whether this is the case for all SCT, as I've seen photos where some have a washer (presumably as a stop) and others without. I’m not certain of the design of the internal focuser and how the travel stops work, so I thought I’d ask here if I should consider placing a washer on the end.
I’ve trolled variously places without luck as to the design by generation of SCT, as I don’t know if adding a washer will adversely affect the focus. My main concern is calibration, which might result in the mirror dropping off the focusing rail. I've read about some disasters with respect to this.
https://www.cloudynights.com/topic/6...ehd/?p=9296201
https://www.cloudynights.com/topic/6...ehd/?p=9303961
Attached image of my focuser rail system (I'm asking about the screw at the end of the black threaded rod, which has a screw, but no washer).
Cheers,
OIC!