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Entropy - seems a bit odd addressing someone that way but putting that aside - you have a mismatch happening between your rings and plate. I assume your plate is the wide Losmandy D standard as opposed to the narrower Vixen standard. Not all plates are created equal just as all tube rings - some adhere to metric and some to imperial measurements for the placement of mounting holes. Some tube rings have 3 holes that are an inch apart while others have 30mm separations. I suggest you measure your tube ring holes accurately and with that information, give Ron or Peter at Sirius Optics a ring and see which plate will work for you.
A hint - you don't really have to have a screw in each of the three holes in the rings - you could, for example, have one screw in the centre hole only and as long as it is done up reasonably tight, you'll probably be quite secure that way.
A photo of your 'problem' might help.
Peter
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