Actually, I find that, with a little practice, sharpening screws with a dremel is pretty easy. And the heat thing isn't that big of a deal. If you have a dremel with variable speed and you're careful, you can keep the metal pretty cool...I almost never use water. The fiber wheel on a dremel is not like putting the screw up against a bench grinder. And, you can get metal almost as hot with a file...touch the end of your pick when you're filing it some time. It is absolutely imperative that you have a nice vice, though...trying to hold the screw steady with one hand and sharpen with the other is not only futile, but also dangerous.