Cheap vs. expensive rifflers and rasps

Quoted text begins.You can dip the good Italian rifflers in muriatic acid, then wash them off
End of quote.

very well, that brings back the cutting edge and prolongs their usefulness

Thanks for the reminder Walter, there was some discussion about rifflers
previously: http://aboutstone.org/conversa/arc003/msg00452.html plus
some more if you search under 'riffler'

I have some good quality steel rifflers that were thrashed on sandstone by
beginners, now I'm viewing them in a different light. Perhaps the working
faces could even be diamond electroplated? Probably cheaper to buy new
diamond faced ones.

I was talking to a scientist recently who manufactures diamonds, makes
diamond segments, fashions diamond tooling and then makes the machines to
cut stone. His projects have included 2m diameter floating balls from
polished granite - just a hobby!

Simon