... code 75 rail_head_width_mm:=0.91; rail_corner_rad_mm:=0.15; rail_foot_width_mm:=1.00; rail_fish_angle:=1.5; // 1:n arbitrary unmeasurable rail_web_top_mm:=0.80; // from rail top to intersection fish angle on rail centre-line rail_web_bottom_mm:=1.25; // from rail top to intersection fish angle on rail centre-line rail_web_thick_mm:=0.44; Sketch to follow. cheers, Martin. posted: 12 May 2020 04:35 from: Andrew Barrowman Hi Martin, Something like this then? 2983_112231_020000000.jpg SMP is quite different. 2983_112333_090000000.jpg Cheers! Andy posted: 12 May 2020 08:10 from: Hayfield Andy I do not have an electronic measuring device accurate enough to measure items as accurately as you need, I do know that unlike some rail available C&L fits both C&L and Exactoscale chairs unlike one of the societies own rail, the foot is a very fine profile but the center part of the rail may be slightly thicker posted: 12 May 2020 10:10 from: Martin Wynne Andrew Barrowman ...