I bought this pillar a week ago but the Az EQ6 mount keeps working loose with respect to the adaptor plate. It came with no instructions. I assume I have to tighten the knob underneath (which acts through a roller bearing) enough for rigidity, but not so tight that Az adjustment cannot be made. A complication is that the short post gripped by the 2 opposing Az adjusting knobs is too long and prevents the 2 rotating surfaces from mating flush with each other. I could always file it down 0.5mm. How do other users prevent the mount working loose on the pillar? The 3 retaining screws hold the adaptor piece in place well enough though and otherwise the pillar is very sturdy. This is my first post here by the way.