... is the same as the S1 (7.7/8 "), not the full width of the chair. I have modified it: 2_281210_190000000.png Notice also that I have now given the pan skirts on the screw heads a finite edge thickness. It's yet more stuff in the file, but they looked wrong without. They also have a flat underside to seal against the top of the ferrule for 3D printing. Here's a bit of DXF file attached for you to experiment with replaced blocks, containing only the timbers and markers: 2_281210_500000000.png Block datum is the rail gauge-face, chair centre-line, z=rail top (so all z dims negative). cheers, Martin. Attachment: attach_2714_2734_midland_central_1 8_07_28_1701_24_in.dxf 186 posted: 28 Jul 2018 22:36 from: Martin Wynne Hi Andy, Something I forgot to mention. Blocks are defined only once in the file, so they use the current scale of the control template. In the event that some of the background templates are to a different scale (not very likely, but Templot allows it ...