Hello, I wish to tram in the head of my milling machine, so was reading up about it. It is suggested that before doing any measurements, I "stone" my table to get rid of high spots. These high spots are caused by dropping items onto the table. I've tried to be careful, but still managed to drop the odd item. I bit for reading about "stoning" has indicated that there are machinists that stone, and those that file! Some advocate using a hard stone (like India stone or harder) and some say use a dull file (file that has itself been stoned). The stone or dull file is slid along the table sideways and only cuts into the raised bits. Has anyone here got any first hand information on this matter? How do I know if my dulled file is dull enough? Thanks, James.