(<= (Model-Id $X Counterweight_Guard_Thickness_M01)
(Counterweight_Guard_Thickness_M01 $X))
(<= (Has-Parameter-Slot $X Counterweight_Guard_Thickness)
(Counterweight_Guard_Thickness_M01 $X))
(<= (Counterweight_Guard_Thickness $X 0)
(Counterweight_Guard_Thickness_M01 $X))