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Over a number of years back in the 70's I had three Newts I imported from the U.K, 6", 8.5" and 10". All had the primary mirror permanently attached
to the rear cover plate with adhesive. So to inspect or clean the mirror I just had to undo the 3 [6" and 8.5"] or 4 [10"] retaining screws and remove the rear cover complete with mirror. As the cover plate retaining screws were a very snug fit, the only collimation adjustment possible was the secondary mirror. I used these scopes for years for public outreach, and rarely had to make any adjustments. From memory the permanent attachment didn't seem to introduce any aberrations.
raymo
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