not all forearm wood is good for threads. a solid one piece butt will have to find 31 or 32 inch stock, and most is sold in 30 inch length. use exactly 1/2 inch wood for the pin. i do a lot of pins at one time, i cut them with about 1 3/4 inch of thread and then cut them with a 2 inch smooth 1/2 inch piece thast glues into the butt. i then soak them in thin super glue, and i mean soak. let them dry and put aside for future use. when i get ready to use one i put it in the lathe check for straightness and center drill a small hole in the nose. i will only use about half of what i cut because they are not straight. after cutting the female threads into the shaft, i use a .42 inch hole any smaller and the shaft might split, and go slow, back it in and out, and clean the cutting threads or the shaft will split. when its cut soak the female side with super glue, when dry recut. and you will still have to sandpaper the pin and use a small triangle file on the pin to make them fit. l