Rotary mechanical splices between axially aligned optic fibers are seated der axial compression within bays recessed into the body of a holding tray on which a retention lid is fastened in a position to which it is guided by fins on its underside received in grooves formed in the tray body. In such position of the lid on the tray, the lid underside surface covers access formations and the bays between the fins having portions covering fiber slots in the tray through which the optic fibers extend in alignment with their splices.
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