Can anyone tell me the applications for which the interior pull switches were used on twin plug set ups? I believe they were used on at least the R and maybe RSR? Anyone know how they were wired and how they were used (e.g., normally in the "out" position and then pushed in to disable the upper and lower ignition)? In the LHD R's, I have seen them located in the same spot--on the far left of the ignition switch. TIA for the info and any pics you can provide.