Consider the infamous slug. Slugs were pieces of threaded pipe, typically 2, 4 or 6 inches long, that were used to increase the length of a fork tube with as little effort as possible. The concept was as simplistic as the execution. Essentially, the fork cap was removed, the slug inserted in its place, and just like that, you had an extended fork. You could then slide the tubes down in the triple clamp for that boss custom look.