heyas; just this quickie advice: TWIST BAR: everything beyond the green end DOES move. everything beyond the red end does NOT. in between is the blend zone. JOINT X: everything between the green arms DOES move. everything between the red arms does NOT. in between is the blend zone. MAT SPHERES: everything inside the green sphere DOES move. everything outside the red sphere does NOT, unless it is also in the green sphere (green overrides red). in between is the blend zone.