The twitch coils are in place in the disk rim and each is driven by 2 turns in the white necklace bundle that is above the black primary coil. The necklace coils are 14ga wire inside of poly propylene tubing. Each twitch coil has it’s own independent 2 turn coil in the bundle. One side of the twitch coil is connected to a segment of the shell inter foil and the other side is connected to the groundplain and the next segment. To the left is the central cage, formed by the structure frames. The shell field driver coil will be installed in this space.
pgtruspace's blog 
The twitch coils are in place in the disk rim and each is driven by 2 turns in the white necklace bundle that is above the black primary coil. The necklace coils are 14ga wire inside of poly propylene tubing. Each twitch coil has it’s own independent 2 turn coil in the bundle. One side of the twitch coil is connected to a segment of the shell inter foil and the other side is connected to the groundplain and the next segment. To the left is the central cage, formed by the structure frames. The shell field driver coil will be installed in this space.