I shoot a Wensel Woodman. I go one direction, same with my knives but I know on the Lansky system they go back and forth. Either way, you are removing metal and sharpening the edge. I cover the edges of the broadhead with the sharpie and push into the teeth of a large file, counting the strokes and flipping it etc. I had these guide blocks I bought for two blades but I still used a sharpie to guide me in taking metal off. I am MORE than confident that there are more knowledgeable guides on here than me that will be along shortly! Bedtime for Bonzo, sorry I can't help more right now!