Hello, I am the point no i have whiskered the stock of my rifle once. But i doing so I left the stock pinned to the barrel, and in the course of sanding it numerous times I have accumulated a dark area on the wrist below the tang that I assume is small amounts of metal. My questions are (1) should I unpin the stock from the barrel and continue (2) is the dark spots OK, if not how do I get rid of them,and (3) will thee metal shavings have an effect on the staining of my stock. I was going to try Ferric Nitrate but not if there will be a chemical reaction with the metal dust. Thanks, this is my first build so I have no idea what i am doing.