Training was supervised by the nominated head of the Czech section, Major Alfgar Hesketh-Pritchard, who turned to Cecil Clarke to develop the necessary weapon, light enough to throw but still be lethal to an armour-plated Mercedes.[14] During extensive training, the new weapon was found to be easy to throw by Hesketh-Pritchard, who had a strong cricketing background, but less so by Gabčík and Kubiš.[15][16]