Use a froe. A froe is very helpful, too. Oh, and a froe works well. It's the only way I have found to accurately split shafts from logs. I have usually split the trunk like you would for firewood or bowstaves to make shafts (or more like making shingles actually.) With the froe, you can keep the splits pretty even in thickness, then drawknife, hand- plane, tablesaw, joint, or belt-sand them down to 3/8" thick boards (or thicker for the big blunts). Split or saw the boards into square arrow blanks. Hickory is heavy, but tough.