For my counterweight, I've got a rope going from the head, through 2 pulleys on the ceiling to a bag filled with junk.. What does a high end machine do for a counterweight? Can't really see because it's all enclosed. They would never use those gas struts that hatchbacks use would they? Also, is it best to have the counterweight exactly as heavy as the head or should the head be a little heavier so it takes up the leadscrew slop?