My Ticket.

I had to drill the large holes in the back of my hand-made doors in order to use these European concealed hinges. Without a drill press, which any small shop would have, I had to do it by hand. The smallest slip would make the door unhangable, or worse, the bit would puncture the front of the door and destroy it. So to be extremely safe, I devised this precision depth gauge, pictured below, which I have every intention of patenting. It should make me millions, over the long haul, don’t you think?