Vision Center Finder

I printed this in PLA and used a white Sharpie paint pen to color the raised sight portion of the tool. This is a simple tool to check that your vision center aligns with the point of aim.Point the tool at the desired contact spot on the cue ball.Aim with your cue over the tool.Focusing on the aim point and without moving your head, move the cue aside.If the top and bottom lines on the tool are in alignment, you (and your vision center) are in line with the shot line.If the top line is to the right, your vision center is skewed right and you are not aiming where you think you are. Your head needs to come left.If the top line is to the left, your vision center is skewed left and your head needs to come right.