Fast Adjust Spring Technology
F.A.S.T. makes spring preload adjustments easy, with only a 4 mm wrench required.
No longer are a hammer and punch required to adjust spring preload. With this system, a pin in the preload ring fits in a slot ground into the spring. The rider rotates the spring (which has easy access) to tighten or loosen the preload ring and thereby adjusts spring preload. The blue clamp ring holds everything in place by tightening the 4 mm hex head screw.
It also has a flange that rides on the reservoir, which keeps the 4 mm screw in the proper orientation for easy access. The whole system rotates on an ACME load-bearing thread, which ensures easy rotation even under load from the spring.