FIDDLEBACK - "Ironwood. ...(Horrid to sand and file though. It will clog a file so bad that you've got to soak it in oil for a day to get it clean. It laughs at my wire brush when I try to clean the file with it.)"
Fiddleback, a suggestion here. Many years ago, I read (somewhere) how to clean out a clogged, but otherwise still good file.
This technique has worked for me cleaning some really gunked up files over the years.
Take an empty brass cartridge case -- .30-06 case works just fine -- and crush the neck flat in your vise. Then lay your file on a table, bench, etc., and just start gouging the flattened brass neck into the file's grooves. After a bit, the file itself will cut tiny "teeth" into the brass case and they will scrap out whatever residue is clogging the file's grooves.
Give it a shot and see if it works for you.
Very handsome knives there, by the way!
L.W.