I find a different style entry thimble in Randal Pierce's book, Kentucky Rifles of the Great Smoky Mountains for which I could use some help. It is on page 42, rifle #20 by Isaac Messer. I cannot see whether the apron or skirt is a totally separate piece of sheet iron, pinned in place to add protection of the wood, with wood exposed between the skirt and the thimble tube or whether the tube and skirt are one piece and held in place solely in the traditional manner. I would have attached a picture but have not asked permission of the author. Thanks for your replies.