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This is the technique I developed for making the coils. I used 2 PVC couplings joined with PVC glue. I made a little half hole in one end to act as a starting point. The tubing when you bend it will deform enough that repeated movement will eventually fatigue the bend. To combat this I insert an piece of #14 wire folded back on itself 3 times. The end of this wire is left long. It is inserted into the end of the tubing. This wire is inserted into the tubing farther than the bend points in the tubing, and the single end is left exposed for the lug to be inserted onto. The lug happens to be a snug fit into the ends of the tubing. Prior to winding the coil play with the lug to make sure you don't have to swage the tubing to accept the lug. Once the wire is inserted swaging the tubing will become very difficult. The first bend is at the perimeter of the coil, and the second bend is such that it is about 3/4" back from what would be the center point of the coil. This allows for a nice square fit on the pole. The lugs are silver soldered by sweating the solder into the coil, and the wire is soldered to the middle of the lug. This particular coil is 5.75" in diameter and is about 6 in long yielding a 1:1 form factor.