I am going to be replacing a the right side on-off valve on a Star Griddle, model 648M and I was wondering, since the valves are screwed into the top of the manifold and there is a bracket welded to it right beside the valve, how can the old valve be unscrewed when it will hit the bracket as I and unscrewing it. The same question would apply to putting a new one on. Am I supposed to disassemble the valve so it has room to get by and then reassemble it? This seems really stupid.... I must not be seeing something....