Originally Posted by
Toolmaker51
A more useful tool already exists, that drives individual nails, to clinch foot and head of close spaced cripples, near door frames, and frequently corners of stick frame construction.
It's a long tube, ID accepts head of 16d or 20d nails, a rod with a striking head...a simple design.
I'd find a small ID tube with a thick enough wall to notch a 'loading port' to save fully withdrawing the drive rod. Visualize a single shot bolt action rifle. An alternative would reinforce area around port with a close fitting sleeve.