Quick and Dirty.  Allows you to use the Tair 3 with Skywatcher 80-90mm tube rings.  In order to use the print effectively you need to remove the cocking mechanism (this is just 4 screws holding it in place).

You need to cock the mechanism to the aperture is fully open and then use stepdown rings to get the best F-ratio.  I also highly recommend lining the inside of the insert with flocking material to increase friction.  I've used this setup successfully to image with the tair 3 and a dedicated astro camera.

There are 3 inserts which correspond to the 3 different diameters of the tair 3 allowing you to fit them best for your setup.