On the nut of my Read Model P I noticed that instead of the bottom of the nut being glued into the bottom of the nut slot, there is a piece of rosewood (same as the FB), the same length and width of the nut and about the height of a match stick glued to the bottom of the nut. Then the nut is glued into place (actually the nut isn't glued into well so I have to reglue it. It fits tight anyway, but that's beside the point). Is there a reason why the nut may have been put in this way? The nut is bone, if that makes any difference.