Hand rasp making illustration from Weygers: *LINK*
David Barnett - SW Florida
>There are (or used to be) online links to case hardening rasps with lower carbon steels, as well. It's actually doable - not too difficult - and likely worth the effort with the demise of Auriou.
BTW, illustrations prior to page 256 in Weygers show more on cutting teeth for files and rasps.
Rasp making