This happened on my old stock with a round tiller, what I did was take two penny washers and drill the hole to match the pin diameter, then greased the pin and araldited the two washers to the top and bottom of the tiller. When that set I removed the stock and wound carbon around the tiller over the washers, redrilling through the carbon when done. The job was a good-un, but as it was me there was resin everywhere.