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The tracks for the dome slit were added to the structure. The lip on the bottom of the framing was used to retain the lower 3' door section to the dome. The slit extended from the lower sill to about 10 degrees past the Zenith. The upper dome slit cover was slid over the dome to the side opposite the opening and hung onto during observing session. The lower section could be either left in place if observing near the horizon was not anticipated, or quickly removed if needed.