I think you hit it right, ghost. The screws in the gb were torqued too much. I can now pinpoint the problem. I know exactly what was happening. That little block thingy in the front part of the lower gb could not move because that front screw was too tight. So it is that front screw in particular that cannot be torqued too much. When I released that screw a half turn the little block could spring down easily when the upper gb pushed it. Without that thing being able to swing down the gb was not going together properly.
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