Hi all,
Thought I'd share the clip I designed to fit a Right Angle Finder to the polar scope on my Star Adventurer mount.
I designed it to work on my Neewer RA Finder but it could possibly work with similar ones (that have the removable adaptor plates for various camera types). My finder came with a few different adaptor plates and I chose the metal screw-together type which was labeled for use with the older Nikon F series cameras.
As you can see from the photos, this just screws into the printed clip allowing you to leave it in place on the Polar Scope but remove the RA Finder easily. It is best oriented with the clips at the top and bottom (rather than on the side).
I've made it available for download from Thingiverse, there's a printable version of the adaptor plate on there too (along with instructions and pics) should you need it.
https://www.thingiverse.com/thing:2762334