The mirror shouldn't "Clunk", but in saying that they are a Floating mirror setup aka, its not stuck down!
The mirror shouldn't be touching the clips at all (you will induce astigmatisim if its touching) and when it is mounted it will sit down in the mirror cell so it isn't required. the clips are to stop the mirror falling out and down the tube.
Do not be affraid of the OTA it is simplistic in design with nothing to stuff up that you don't already move around! With the collimation tools it is a matter of once you put it back together align the dots/reflections
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