Just a little something I knocked up from a 6", sorry, 150mm nail and a piece of aluminium tube. The point of the nail is ground off and notched to engage with a smaller jolt nail head, and the aluminium sleeve keeps it on target when you whack the nail into otherwise unreachable places. The sleeve still slides a bit, so you can thump the nail all the way home and the sleeve obligingly moves out of the way.
