every -- >> every single piece of brass you see on here needs to be polished with this stuff called semichrome a little time consuming, but when you put it on the horses and the sun hits it just right, it's beautiful. so we take a lot of pride in what we do, so we try to make sure it's excellent for our fallen brothers and sisters in the cemetery. >> i have seen a collar like this last maybe seven, eight months without being repaired, if it's properly maintained, but ideally at some point, we always keep one on hand so we can also just maintain it. as far as rebuilding it totally, i would probably say about a year. >> this machine here is called a guider. it actually can take the leather from one thickness to another. this is called a skiver. it does the same thing. but it's hand-pulled. >> this book that you showed, 1916, does it have specific thicknesses for all the -- >> yes, it does tell you the thickness of the leather that you should actually start out with. yes, it does. and all of our equipment, we dye or split. i will show you. this is a strap cutting machine, which is the new version