Microfocuser for C8 orange tube

Is there a Feathertouch model (or something similar) that is compatible with an older (80s) Celestron C8 orange tube?
A couple of the websites with 8" SCT Feathertouch say they are not compatible with older orange tubes.
Thanks!

Werner had told me that the old scopes aren't compatible as there is nothing to keep the focus threaded rod captive. Newer C8's had a snap ring at front of the central baffle tube that kept you from moving the mirror too far forward and thereby disengaging the threaded rod from the Feathertouch micro and letting the mirror slide off the baffle tube but my old orange tube C8 (CA1974-75) does not have this as it had a washer screwed at the rear of the focus rod that acts as the stop.

Dave

Why not just a FeatherTouch with the SCT adaptor that allows you to "screw" the FeatherTouch onto the threaded ring that the eyepiece adaptor is currently attached to?