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TR4, 4A, 250 and 5 BACKLIGHT FRAME & HARD ROOF PANEL
Firstly, to clarify the correct description of Hardtops and Surrey Tops, although the general arrangement of fixed rear window with removable roof panel is generally referred to as a 'Surrey Top' car, this is in fact not correct. The cloth section, which replaces the roof panel, is the 'Surrey Top'. The rear window and frame is called the 'back light` and the roof panel is self-explanatory.
Revington TR has developed an ingenious new Backlight design, which incorporates a roll‑over bar (ROB). The Backlight frame is made from fibreglass, but uses for its strength an integral ROB with two backstays. The bar fits right up inside the fibreglass frame, thus affording maximum rollover protection, along with better rear visibility than with any other rollover bar available for use with a fixed backlight. The legs of the main hoop extend to the floor, whilst two rear stays attach to the top of the rear wheel arches. The main hoop is bolted to the 'B' posts too for added rigidity. Surrey tops and all three types of roof panel can be used in the normal manner.
Whilst the arrangement is much stronger with a ROB incorporated, Revington TR also offer a 'standalone' fibreglass back light frame which is constructed of much thicker fibreglass and does not need a ROB. It should be noted that this configuration is not as strong as the original aluminium and certainly nowhere near as strong as the ROB supported part.