My friend at Firearms Outfitters has used my electric checkering tool with carbide blade to checker Colt Government Model frames and similar for years, but the LPI for that application is about twice as fine as typical buttplate checkering. I've done some metal checkering with the Brownell's special multi-line checkering files in the medium LPI range, but only on smaller items like thumbpieces, etc. Brownell's also sells a curved single-line triangular file in both 60-degree and 90-degree forms, made for pointing up wood diamonds but works OK for steel also. The Brownell's multi-line files work better if I grind away most of the width of the file, leaving only about 2-3 parallel rows of cutting teeth instead of 8-15 rows.
It's a problem finding nice stuff, I have long been a hoarder of fine gun furniture items for that very reason but my supply has run out!
Regards, Joe
