U was given a (Millers Falls Holdall No. 731-12IN) brace and a set of 32 (Wright's Jennings) auger bits which are too dull to be used and need some cleaning up of cutting edges. Grinding/honing everything by hand is intimidating. Is there a machine to do this or a place to send them out too? There are fine-thread screws in the middle of each bit which I have no idea how to sharpen. The outside looks sort of like square mortise bit augers, except the larger ones (>1") have two horizontal cutting surfaces and two spurs. Thanks in advance.