I was trying to help a guy over here in the UK set up the Orion OAG....
he was having endless problems etc etc etc so I asked him to send it to me to "set-up" for him...
The problem was the pick off prism had rotated off axis due to that screw!
I fixed it and set the necesary spacers etc but it was too late; the guy decided it was "all to hard" and sold the OAG and went to an ST80/QHY5 arrangement.
