Because we were Mancunians, they are poor than Lancastrians, we made our own pea guns out of wood, hardboard and thick elastic bands. They were and still are the bees knees. Just think how powerful they'd be with todays catty elastic on them??????? Boy would your arse sting if you were hit with a pea from one of them!
Thinking about it now, the skills you learnt in carpentry were good, taught you knock panel pins straight, along with sawing in a straight line. Tolerances so the trigger fitted in the handle and worked smoothly. Sanding down and probably other I've forgot.