i will try to describe this as best as I can. When i check the spine, I look down the blade towards the point. I then grab the handle or tang and hold it out i front of me at eye level in my right hand with the edge away from me and the tip pointing to the left. You have to look at it straight on. I you look at it off angle, it will look like it is a bit bent. But, if you move it around, or switch hands and it looks like it is bent equally in opposite directions depending on whether the edge is too high or too low or going from your left to your right hand, then it is probably straight. :big grin: I usually stand in the door of my shop and use the wall across he driveway was a back backdrop.