The 180 is the length, the 64 is the diameter, and 61 is the spring rate in metric units. The spring rate is in kg/cm units, so you will need to convert it to lb/in to find the standard measurement.
You don't need an adjustment wrench either. Just loosen the allen screw and turn by hand.
Last edited by Provocateur; Jun 4, 2007 at 06:58 AM.