You absolutely can check cam timing without a draw board. I use my bow scale with a backup string in case the d loop fails. Just pull it down and watch when the draw stops hit. All you really need is something to hold the bow back safely as you observe the draw stops. Twist cables a half twist at a time until they hit together, or better yet when your bare shaft hits the same as your fletched at 20 yards. You really don't need the paper either unless that's your preference. Twisting the cables has more effect on the vertical than raising/lowering the rest.