Instructions: 1.- Remove the plastic cap from the cartridge. 2.- Insert the narrow end of the cartridge into the slit in the application device, making sure that the spike goes down until it can go no further. Turn the knob on the front of the device clockwise until the cartridge is held firm in a vertical position. 3.- Insert the fork (with the stamped number facing upwards) into the corresponding slot and push it in as far as it will go. 4.- Remove the fork. A DIN 6799 circlip is now held between the two prongs of the fork and is now ready to be slotted into the groove on the shaft.