This clip is to attach a Right Angle Finder to the polar scope of a Skywatcher Star Adventurer tracking mount. The photographs show the original version of this clip, I have since updated it to be more robust.
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 have also included a printable version of the adaptor plate for those of you that don't have the metal one that came with my finder. This is in separate parts so that you can print them without any support and glue together to give the right slot thickness for your RA finder. However, please note that this has not yet been tested (as of 19th Jan) but I may do so in the future. There are images that show how this should go together with the inner washer in place first so that the outer parts sit in their correct positions.
I hope that you find it useful, but use at your own risk.