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Okay chaps this is what I did many years ago with my mid 1970's Celestron 8". After removing the primary and corrector with secondary, I drilled 3 holes into the base of optical tube and threaded them to fit 1/4" thread. I then placed a small dob of silicone on the end of each bolt. Once focus is achieved the bolts are screwed lightly and evenly up against the rear of the primary to hold it in place.
DANGER.....DANGER.....DANGER! You do this at your own risk. But I am always looking for the easy way out.
Sorry I don't have any test results to say how successful this was, because at the same time I stopped using my C8 as a guide scope on the 16" Newtonian and went to a off-axis guider.
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