The idea behind the TCV was to increase the damping as the fork got deeper into the travel. The main fork spring sat on top of the TCV spring shown. A control rod going through the center of the damping rod is attached to a piston. This piston closely fits the ID of the damping rod. As the fork spring compresses the TCV spring compresses. The piston gradually shuts off a compression hole near the bottom of the damping rod making it stiffer. This only lasted a couple of years as the increased harshness deeper into the travel didn't outweigh the benefits.
Enlarge the Compression Feed Holes
Enlarge existing compression holes to 8mm (5/16”) and drill the TCV hole through to both sides. You will end up with six holes (3 sets of 2 holes).
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