Christopher wrote:

My understanding has always been that only the 6-footer could separate the saucer. That's why they stopped using the saucer-sep maneuver in the show -- because the 6-footer was too unwieldy to work with, and it was the only separable one they had.
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*Nods* When they pulled it out to shoot the sep sequence for Generations, it hadn't been used in a long time.