40 The Annunciation retable Quick disassembling device For future treatment and accessibility of the large painting, a system was installed that allows for its removal and reinsertion without the need for scaffolding. For this system two wooden sliding rails were mounted to the inner jamb boards of the retable. They carry two short pieces (25 cm) of aluminium U-profiles at their upper end with an opening, serving as locking slots for two runners, (Fig. 63, 64) specially formed oak dowels fixed to the painting on the back corners of the upper stretcher bar. Additionally, two webbing-belt grip handles were fixed to the back of the bottom stretcher bar for handling. Fig. 62: Installation of the rigid backing; the polyester loose-lining is visible in the right-hand spaces between the bars of the new stretcher Fig. 63: Sliding rail with U-profile and opening at the top stretcher Fig. 64: Oak dowel runner at the top bar of the stretcher
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