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Hi Roger. I also brought one a few years back. Firstly, | found that collimation will shift from horizontal to vertical. I cut some 10 mm x 20mm x 0.5mm plastic strips and placed them between the mirror and mirror cell to stop it shifting. Next, I did some work to the mirror cell, replacing the springs and increasing the locking knobs travel by placing a 20mm x 40mm x 6mm aluminium flat with a 6mm drilled out recess to hold a ball bearing and drilled a recess in the end of the locking screw. This gives a bit more tension against the steel plate, (which will flex ) Use the locking screws to do the final tweaking of the primary mirror cause the you do need a bit of pressure. The original mount had some silicone sealant smeared on the bare edges, allowed to dry before assembly. I use the mount to store the scope indoors. I built another mount from 16mm plywood with 200mm holes on the sides to make it lighter to carry. Adjustable furniture feet underneath to keep it reasonably level. The optics are impressive and once set up it delivers a bit more "WOW" in the nights observing.
Cheers!
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