Hi everyone! I just got a used BB IQ reformer, which I love so far! My only issue is with the foot bar. I'm used to a studio reformer where we can adjust the foot bars to high, medium and low. Here, the IQ reformer has two holes and you can reverse the foot bars to essentially create 4 positions, but I can't figure out which one would be "high" and which one would be "low" - any ideas? Thanks!!