I have a problem getting a straight edge on my chip carving knife (Wayne Barton style). I think I must be turning my wrist at the end of the pull stroke across the stone. Does anyone have a technique to 1) sraighten out the cutting edge, and 2) how to sharpen the blade to a straight edge in the future? Without a perfectly straight edge, chip cuts do not meet perfectly in the bottom corner of the cuts, leaving a ragged looking chip. I would appreciate any suggestions from experienced chip carvers.