F1 = the extendible force measured at 5 mm inward piston rod.
The piston rod is hard chromium plated and the cylindertube is zink plated.
Gas-pull-springs must at all times be mounted with the piston rod pointing upwards.
The ventilation hole in de cylindertube must remain open. Please check for that matter the general user manual.
These gassprings are provided with a valve so that afterwards the extendible force can be changed, only increased, not decreased!