OP, I just reread your comments. You don't reblack Damascus barrels, you refinish them properly. You cut for the refinish at the maximum length, not an even length hoping to fool a future owner. The future owner will know the gun has been cut, whatever you do. You can save hundreds of dollars on your restoration and make your gun worth hundreds of dollars more, if you don't refinish the wood. Your wood looks fine and can be improved by a light cleaning without a refinish.