Tony, David Miller builds all bamboo no glass bows, glass bows and also the original type that Howard shot which is the Concave/Convex. There is a formula the way David builds his bows. He builds them exactly the way John Schulz did which John learned from Howard. There are many steps to them, and as far as I know no one builds them the way David does. Those early years when Howard was building bows they tried alot of stuff, and when John learned to build them as well. There is a art to building them the way Howard did and that is why David is a master at it. He follows those techniques to a T, and it shows. I will not go into all of the steps involved to build them as I do not know, but I will tell you this that people would fall over if they built them that way today, lots of steps and time involved. Hope I have not confused you more. As far as I know there is only 2 people still building bows that was taught by John Schulz. David is one and the other is from Missouri. John's boy started to build them again last year but ran into some peronal issues and I have heard he will be back shortly. David is the only one doing it full time though. Flint