Hi
Bit late on the die filler, not sure you know about Vintage Machinery site,
. It has lots of information on many companies like Keller. Not sure which model you have, here is link to Keller 1A model manual:
I have an All American die filler here is a link to it :
I use mine a lot and have a nice collection of files, I find them at flea markets, you need to look carefully but a giveaway is the tang and that there is no taper on any sides, as well as the direction of the cut when you drag it across your fingernail. I have made adapters for short files to fit my machine.
Bob