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I removed the dovetail from my gold 180 mak several years ago and fitted ota rings and dovetail, there is no great secret to doing it. Remove the 4 small screws that hold the corrector plate cell to the tube and gently pull the cell and plate off without touching the glass if possible. The dovetail is held on by 2 small screws and internal nuts, 4 or 5 mm, just undo the nuts, without touching the mirror and remount the corrector plate, in the same orientation as before removal.
Would recommend covering the 2 small holes of the original dovetail mounting with some pvc tape or something similar.
Removing the corrector plate and cell may ever so slightly, affect the collimation but if the corrector is re-fitted to the same screw alignment there should not be a problem with collimation, which can be tweaked via the 3 sets of screws in the rear.
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