[. . . ] Update 01/2004 The Eigenschaften: Each single Plunger has a 3 to 4mm variable screw length "A". [. . . ] If during the tuning of your bow the notching scale cylinder goes close to 0 on the thread scale, change to the "extra hard" spring (0. 70 mm thickness). If the thread scale goes close to 10, then replace the "hard" spring with the "soft" spring (0. 45mm thickness). Following table - included in each sold Plunger - shows how the single springs are reacting: with the "hard" spring (0. 60) on scale position 1. 0 you will reach a tensile strength of approx. You can reach the same tensile strength with an "extra hard" spring (0. 70) on scale position 7. 5. [. . . ] Important: A wrong arrow (an arrow with the wrong spine) cannot be compensated by any plunger! Werner Beiter Daimlerstr. [. . . ]