Patrick....I've worked with a couple of hickory staves. As someone above stated, if the was cut in the summer, then the bark comes off pretty easy, if it's removed immediately. If left on or if the tree was cut in the winter, it's a pain. But you don't have to take all of the cambrium off. Get it down close to the white wood but you can leave a little just to make sure you don't violate the white wood. Some of the brown cambrium left behind will actually give the bow some character. Don't think I'm telling you wrong. I'm working on one right now and have the same issue and I'm leaving on some of the brown stuff. When you get close you can use a cabinet scraper to slick it on down. Sam