I am building a log home and I needed to place one end of my 10″ loft joists in a blind pocket in the wall. The traditional way is to place the joist on top of the log the pocket will be cut into, then use a scriber to scribe the outline of the joist on the log wall. Then you move the joist, rough out the pocket with a chain saw, finish with Lancelot and/or hand held chisels. Takes about 1 1/2 to 2 hours per pocket if you are anal like I am. So, I dug around in the iron pile and found an old sileage blower tube of the right O.D. Cut off a chunk, welded some thick strap on in the shape of a cross on one end. Also welded a hex stub on that had been drilled and tapped for a set screw and with a 1/2″ through hole. Did this all in a lathe so it was relatively true. Then marked off tooth locations around the circumference. Clamped it in a vise, stood a hand grinder up on end and made rough tooth slots. Gave the teeth some set with a pair of fencing pliers. Used a hand file to shape and sharpen teeth. Drilled a 1/2″ pilot hole in the wall, ground a flat on a piece of 1/2″ drill rod for the set screw, and was all set. Chucked it up in the hole hawg, set it on low speed, pulled my cap down tight, and stuck it in the wall. Ya wanta have a pretty good grip on it. Anyway, Drilled 7 blind holes and averaged about 20 minutes per hole. Touched up the teeth after the 4th hole.