Steve:
I'm a bit surprised that George couldn't get his machine to work.He is an exceptional craftsman and extremely ingenious as well.All I can say is that the machine sometimes wins!
Foley supplied standard 7" taper files with their saw filers. They also supplied "bandsaw blunt" files, which are the ones I think George is referring to. Those are a big triangular file without a tang, and a short triangular taper on each end.They were designed to file bandsaw blades, but would work for large-toothed handsaws like ripsaws.They are too big for standard crosscut saws. I've personally never used them.All the files I've used with the Foley have been standard 6" or 7" slim, extra slim, and double extra slim saw files. The 7" files fit the machine better, but I've used 6" files with the longer file holders.
Some parts are still available from Foley. Some can be fabricated yourself.
Rick W