Seems to me you could turn the cue so that the two levels line up to your eyes no matter where your head is.
pj
chgo
Yes, that's my point. For a small device like that it wouldn't take much error in its orientation to make a pretty big difference in your head position. How do you ensure that doesn't happen?I'm sure you are right about that, but I imagine the whole point is to move your body, not the cue.
pj
chgo