I've always wondered what keeps the plane from digging into the piece of wood that it runs against and that guides it? The only shooting board build I've seen that addresses this is Cosman's where he cuts a blade width off the edge of the 1/4 bb ply he's using so that the guide the plane rides on is below the planes cutter. Do all shooting boards incorporate something like this? The Veritas shooting board guide has a small lip the plane rides against. Never had one but it's time to build one, me thinks. And in Cosman's vid he puts a slight crown on the board. Is this common as well? Thanks for any info. And fyi, I know nothing about metal working. Just sayin...