by DIYengineer, published
It is a small custom stop with various holes for different sized nails. With this little beauty you could just set a distant to a ledge and hammer away. Comes in very handy if you have to do a lot of nails for a Wardrobe back covering. Can also be used to mark points quickly a set distance for an edge.
Just print it out and drill a 3mm hole in the stop piece. Just use a small wood screw to fasten the rectangular piece to the stop piece, which clamps it on the frame. Insert a nail into a fitting hole and you are ready to go.