The present invention relates to a barbecue grill assembly 10 including a cooking surface assembly 12 positioned in a cooking chamber 14. The traction control system also monitors vehicle deceleration. The at least one reflector is configured to reflect the light emitted from the at least one light source. Heat is applied from a heat source to the substrate tube at a first end of the soot body to cause the first end of the soot body to begin to sinter and to cause the substrate tube to begin to at least partially collapse around the sintered portion of the soot body. Separation force members such as force springs are sandwiched between the bottom of the top plate and the top of the bottom plate and retained in a compressed state buy a force from a shotgun closing member.