Checkering files are the best way to go. SS bolts work great but if you have access to SS steel rod try that, 304 is your friend just remember it does work harden. Making your own tools and using them to make your own projects adds soul to what ever you make it adds more of "you"! I make all of my knifes, swivel knives too, including the blades, alot of my tooling stamps (mostly bevelers) all of my mauls, to include the"thumper" it is addictive so be ready but it looks as if you are! Your 2x72 belt grinder looks similar to the one I made except I use a multi speed frequency drive/converter... Secondary habit/hobby knife Smith (haven't done it in years) new job eats life.. ugh.. keep up the AWESOME work!!!