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Hi Terran, I had a 12" Bintel Dob and found colmination to be a real problem. One little bump and it was out. Replacing the primary mirror springs with a set of Bobs Knobs springs and knobs really improved the situation immencely. Be aware that reflected light from street lights or outside lights will grossly effect the view you get when looking through a large instrument without any knife edge baffles in the tube.
Don't expect miracles from any telescope, you won't see colour and you won't see the type of images posted on this web site with any telescope without using long exposure photography.
I can only say the guys at bintel in Melbourne have gone out of their way to help me over the years and I would think they will definitely try to assist you if they can.
Another alternative is to find a local astronomy group or similarly minded person in your area and ask for some assistance. You will generally find the astronomy community a fairly friendly and helpful group.
Good luck
Doug
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