Tool holder for modular tool

A modular tool comprising a tool holder, said tool holder being provided with an entry aperture, and adapted to receive a proximal extremity of a tool element in said entry aperture, said modular tool further comprising a securing pin assembly comprising a securing pin, said tool holder further comprising a securing pin channel extending though said tool holder and terminating in said entry aperture, said securing pin being situated in said securing channel so as to slidingly move between a first, retracted position and a second, extended position in which said securing pin protrudes into said entry aperture, whereby in said second position said securing pin traps said proximal extremity of said tool element in said entry aperture, said proximal extremity being unconstrained by said securing pin in said first position, said modular tool further comprising a rocker element having a fulcrum pivotally coupled to said tool holder, a first arm on one side of said fulcrum pivotally coupled to said securing pin, and an eccentric arm on the opposite side of said fulcrum to said first arm, such that either

• a. pressure on said first arm biases said securing pin towards said first position, and pressure on said second arm biases said securing pin towards said second position, or
• b. pressure on said first arm biases said securing pin towards said second position, and pressure on said second arm biases said securing pin towards said first position.