Al, I'm sure you know this, so I'm just saying it in case someone else gets the idea of using old files for scrapers etc.
Make sure you re-temper them first, or they will be too brittle.
First good catch you get, they'll scatter and turn into scrapnel.
Put them in the oven at full heat ( as close to 300 celcius as possible) for a couple of hours, that'll do the trick.
Jay, You've shown several things over the years made of japanese chestnut, and the grain still blows my mind.
Our Hippocastaneum is a boring wood, nothing like that.
Is yours a Castaneum species, because that would explain it.