Simply remove unscrew the rear 2" push-fit adapter from the 60EDF focuser, and screw the flattener into the focuser-end cap for a rigid fit.
The camera-facing rear thread on the Planostar unit is M48 male, which allows the use of the Starwave DSLR Adapter for Canon/Nikon and various Altair Astro M48 spacers for use with CCD cameras.
For use with the Hypercam (12.5mm backfocus) you need the T2M-M48F adapter to change from M48 to T2-Thread.
Spacing from rear flat shoulder of the PlanoStar to the CCD film plane is approximately 54.8mm and you can use the Altair Astro M48 or T-thread spacer system to fine-tune the optimum distance for your camera sensor and filter setup.
Why is a field flattener required to take images with my refractor? All refractor lens systems exhibit some natural field curvature which, while not relevant for visual observation, can be visible in images. This field flattener/reducer screws directly into the rear focuser rotator of your refractor, converting it into an astrograph with a flatter photographic field than the existing lens system alone.