Feather spacing is like remainder spacing with a twist. On stretches of more than three sections, the two end sections will be the same, and the rest of the stretch will be full sections. It can figure in fractions or in decimals. It also takes into account all of the cuts, routes, waste and fabrication charges. You design a standard spec and Vinyl Fabricator produces drawings, an exact list of all items in a job, displayed as either sections, posts, gates or itemized. It includes picket cutting, routing, and assembly costs and charges. It will talk directly to both SSD and CMM computerized routers. If you ONLY fabricate vinyl, we have a special package just for you: The Vinyl Fence Toolbox. Call us for details.