DIY Paper Tape Punch - Mechanism diagram?

I seem to remember that in some cases the pins are not flat on the business end. And of course they have to be hardened, but gauges are likely to be. they come that small. But that still leaves the die block. Would drilling and reaming be good enough? Probably. The pins need to work smoothly, but with no excessive gaps or they won't punch cleanly. Remember the die has to be made in 2 parts accurately aligned to leave a slot for the paper tape to run in. And of course (the relatively easy part) you need 9 holes in a straight line at 0.1" centres. You then need to harden the die without distorting it. It's not impossible (after all these things _were_ made once). But it's not the sort of thing you can do with just hand tools I think. -tony