From the unusual mind of Australia's Trevor Reeves of Artisan Kite Fittings, we give you MKS end caps. With a hole drilled through them and a nylon tension screw, you can use these in a multitude of ways to attach spars to sails.  Say goodbye to pockets! Available in 4 sizes, to fit rods with diameters of 5.5mm, 6mm, 8mm, or Skyshark P100/P200/P300/P400 spars.