On occassion I have a need for multiple wooden discs, and they are a PITA to make with a hole saw. I've researched it, asked questions, and didn't get any satisfactory answers. Awhile back I came up with the idea of making a master so I could rout them out - hey, easier and faster than messing with a hole saw. This morning an even better, and faster, idea struck me. I don't know if anyone has thought of this before or not, probably have, but if so no one ever passed it along to me. Use a hole saw, drill almost completely thru your piece of wood. But then instead of flipping the wood and drilling thru from the other side, just run the wood thru the planer. I've not tried this yet but can't see any reason why it wouldn't work. Be a whole lot faster and easier than any other way I've ever heard of.