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Not sure what your Mount is, but for the dovetail to be longer than the clamshell is a waste. Technically it only needs to be long enough to fill the Mount aperture but that may not allow optimum mechanical connection between the dovetail and clamshell becoming a point for flexure. Also, a dovetail bar approaching the length of the clamshell will allow finer tuning of the alignment of scope axis and Mount axis.
In reality, a compromise.
Brian
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