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Nice ! Lunar & planetary observer ?
Looking at your photos, it appears your mirror could slip out of the mirror cell during transport or if the scope is up-ended, or did you use silicone glue to attach the back of the mirror to the supports, but allow it to expend/flex ?
Also... its important that the 3 side clips around the primary don't apply pressure on it - this pressure will distort the mirror. It should be an easy smooth fit to slide in.
BTW the sawdust finish inside works - I have seen a scope like that. Not pretty but very effective at maximising contrast.
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