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Step 8. The trapdoor
Make the trapdoor up on a level surface. The trapdoor consists of 150x25 (1x6) floorboards nailed to two 45x345 (1 1/2x 1 1/2) pieces of wood 450mm (18") long. See the 'floor and trapdoor plan' for dimensions.
Next, nail a fillet (which is an off-cut from a floorboard) to the side of the frame member f4 directly under the hinge side of the trapdoor. This is to give the trapdoor support when people are standing on it.
Lay the trapdoor in place, ensuring that the gap is the same on the hinge side and the opposing side. Screw on two 150mm "T" hinges, approx 50mm (2") in from each side.
Drill a 25mm (1") finger hole positioned approximately as shown in the illustration
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