I started to cut these by first drilling a 1/4' hole at each end, and then using my Dremel with a cutting wheel attachment to cut out the PVC between the holes. The placement doesn't need to be in any kind of precise relationship on a given pipe, but you do want all 4 to be pretty close to the same. Mark the location of these slots on all the lengths before you start cutting them.
Optionally you may also put in a shorter, wider set of holes at the opposite end, through which you will thread the leather straps. The slots need to be about a quarter inch wide, and 2-1/2 inches long, so the elastic will fit through.
Each length of PVC needs a pair of long holes in it, one about 4 or 5 inches from the end, the other about a foot and a half further down.
