KALLER Controllable Gas Spring - KF2

KALLER Controllable Gas Spring (Patended product) is a family of gas springs, for use in press tools, that can be locked in their bottom position and where the return stroke of the spring can be controlled.
KF2 is the next generation of Controllable Gas Spring, which superceeds
the KF spring. 

The guide length and stroke length of the KF2-A spring is adjusted by installing and/or removing spacers between the upper and lower guide.

See the working procedure PDF-file (KF2-A.pdf) 
Or see a animated guide WMV-file (adjustthestroke.wmv)