It leave a little extra wood on the forearm until I am ready to install the nose piece. Then I make the nose piece and inlet at the same time working the two together. Cutting/filing the opening at the muzzle has always been a slow trial and error process for me. I wish I had a better way to do it, but have yet to figure out one. I have gotten smarter about the rivets. I use a heading plate to form the inside end on my rivet. That way, I only need a drill and a countersink to install it; no chisel.