BAL Leveler - he-ruide
This is a close up of the covered screw.  I use a large thumb screw to thighten or loosed the clamp.  When thightened, I can carry the BAL level by holding the foam.

This is a close up of the covered screw. I use a large thumb screw to thighten or loosed the clamp. When thightened, I can carry the BAL level by holding the foam.