The small pin in the cap runs in a groove in the body and locks the two together. The trigger (seen to the right of the refill) is pressed in, then across to one side to keep the Parker Ball Pen refill locked in the extended position.
The small pin in the cap runs in a groove in the body and locks the two together. The trigger (seen to the right of the refill) is pressed in, then across to one side to keep the Parker Ball Pen refill locked in the extended position.