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IMG4171 Hole for 1/4" 20 tpi T-nut that will guide the tangent screw

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Now comes the all important hole for the tangent screw on one of the boards - which henceforth becomes my BOTTOM board. Since my 'tangent screw' (pictures coming up) has 20 threads per inch, this hole needs to be centred EXACTLY 290 mm from the centre of the hinge if I have to have any hope of 'driving' the mount manually at 1 rpm. This picture shows the hole and a 1/4" T-nut (with the same 20 tpi) that will sit into that hole. The idea is to use the T-nut to guide the 'tangent screw'.

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