I got a 3/4" and mine works great. I also picked up some carbide rasps off the internet at a really good price. I believe the ones we got from salty are some type of HSS. I find even though the carbide is supposed to be sharper and harder that the HSS from salty cut better. It could just be that the carbide ones are Finer with smaller grooves and don't remove as much material. In the end, both work great. You don't even have to sand at all when you are done.
Take the time to set up some sort of jig or vise to hold your stock. That has worked out for me to get it started then I use my hands to shape. Once you get a little material taken out and take your time with it it doesn't slip and you can move the plug around to shape the mouth. I also learned from others that you shouldn't plunge down into the plug. You'll know you went to far if it starts to squeek. I just take out a little and then shape it by hand.
Eric
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