Well then, since we are still on the crossbow thematic - Thats my repeating crossbow with pump action mechanism. We made it quite a while ago. Well it wasn't me either - the woodwork was done by a carpenter, the trigger by a machine shop worker. Now i don't have the schematics since it wasn't done by me( i was mostly observer), and i can't disassemble it entirely - the trigger is screwed in, but i will take a photo session to show how the parts go.
Its very simple and easier to make than the the lever action crossbow - the chinese chu ko ni. A bit lacking in power but thats mostly because well - none of us knows how exactly to dry wood for bows, and it takes both hands to cock it.
Magazine holds a good half a dozen bolts though you can stuff in more(I don't overload it).
Here's a video of it working - firing a 5 bolt clip.