... but I seem to end up with extra lines at the switches and confusion. Any help would be most appreciated please as I seem to be at an impasse.I think once I have mastered this first slip I should be able to complete the other.I also enclose the box file.2110_291142_090000000.png Thanks. Trevor. Attachment: attach_1893_2496_upslip_crossover .box 254 posted: 30 Jul 2014 12:10 from: Martin Wynne Hi Trevor, You moved it while I was preparing a reply! Hi Trevor, You have used standard switches instead of the preset slip switches: 2_300644_220000000.png Also one of your switches is a 9ft switch, which is unnecessarily short for a 1:7.25 slip. If you use the preset slip switches and peg them on to the TCP and MCP positions, the blade tips will be correctly supported on the timbers and clear of the check rails. (At present you have them in fresh air, and one opening behind the check rail): 2_300700_410000000.png Also you have long transition zones running through the slip switches, which tends to be unnecessary and confusing. I am not ...