[Tandum (Robin)]

Here's a couple of pics of what I ended up with here. The qhy5 has the 1.25" nose removed and it screws directly to the t-threaded tubes.

As I remember on initial setup I pointed it to M8 or a similar heavy starfield, focused the qhy9 and then looked into the guider stalk with a hand held eyepiece and rotated it until I saw a star in the FOV. I then moved the eyepiece in and out to find the approx focus point. Then I put on the guider camera and started messing with distances till I had focus on it. Done.

I also pulled the thing completely apart as it was so sloppy. I put a strip of mylar sheet between the inner and outer tubes that rotate around each other and that made it a lot more stable. Before I did that I found you could get a star on the guider but when you tightened up the lock screw the star would move out of view.

Once you get all that right, you might find the prism intrudes into the light path as per the attached flat. I tried lifting the prism a bit but found that made it a lot harder to locate a star in the guider so I just live with it.