Here is picture of a fly-press. Spinning the balls screws down a punch through the sawplate into a die , notching out a tooth.
We will have Lui Rocca’s fly press at Sawfest in Sheffield July 27 to 29 , 2018. So if you fancy punching out teeth in a plate contact me and we’ll make it happen. All we need is suitable steel and I do think we can get some in Sheffield. Or bring an old saw and we’ll have it toothed up far quicker than filing it from scratch and with far less expense in wearing out your files. Lui tells me he has a way of making progressive pitch happen. I look forward to seeing this!