I am sure this has been discussed before but just a heads up for new to flintlock guys like myself. I was having trouble getting my jaws to grip the leather and hold tight on the flint. I tried thick, thin, supple, hard, it helped some but seemed to always need something else. It seemed that the tighter I tried to turn it the more it wanted to move about. I have a couple of checkering files so I just filed across the faces of the the jaws that contact the leather. It is amazing how it will hold and I don't seem to need to tighten it near as much now. Anyway, a simple fix, hope it may help someone out.