Dispenser

A dispenser for dispensing materials, comprising:

• a dispenser body having a receptacle for a container configured to hold the material;
• a driving rod movable relative to the dispenser body along a longitudinal axis and into the receptacle;
• a trigger lever having an actuation member configured to displace the driving rod along the longitudinal axis upon rotation of the trigger lever around a rotation axis;
• a pivot member that rotatably connects the trigger lever to the dispenser body and defines the rotation axis;
• and
• the pivot member movably connected to the trigger lever such that a lever distance between the rotation axis and the actuation member changes upon movement of the pivot member relative to the trigger lever,
• the dispenser comprising an adjustment mechanism to adjust a mechanical advantage of the trigger lever by changing the lever distance,
• the adjustment mechanism configured to adjustably fix the lever distance to at least a minimum distance and a maximum distance, and
• a position of the actuation member relative to the driving rod or the dispenser body does not change when the lever distance is changed.