Paul Mon said:Not a bad system. Just one little problem with it. Unfortunately you'd be committing a foul every time you set your cue down.
3.42 DEVICES
Players are not allowed to use a ball, the triangle or any other width-measuring device to see if the cue ball or an object ball would travel through a gap, etc. Only the cue stick may be used as an aid to judge gaps or as an aid to aligning a shot., so long as the cue is held by the hand. To do so otherwise is a foul and unsportsmanlike conduct. (Also see Rules 1.3, 1.4 and 2.15)
You can devise any system of measure that you like with one hand, then...
