was reading an old test on the IT490 and the testers mentioned a Yamaha wrench instruction where they moved the piston position in the shock reservoir by 10mm and this helped with square edge bumps, took the harshness out of the system. How would moving the position of the piston make the shock react quicker over sharp bumps? if the pressure behind the piston (I think its 125psi) is the same for one position as for another then the force required to move the piston would be the same?? any ideas maybe Walter?