Is it adviseable to try to keep the soles of hand planes scratch free, assuming that they have been flattened previously? I read that cast iron can lose its trueness with age and use. Occasional light burnishing on some 400 grit paper on a granite block would take care of this, but I don’t want to thin the soles too much. What do some of you do to maintain your planes (other than sharpening)? One recent tool review commented that L-N plane soles are so true that they recommend never using anything abrasive on them.
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