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1967 Oldsmobile Toronado hiding headlight operation

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Hello i have a need  to get info on how the hiding headlights  vacuum system works/ does the vacuum  pots require full time vacuum supply or do doors stay closed if vacuum is held in the pot by just stopping vacuum source and holding vacuum in the pot? I know when vacuum is released the  piston rod jumps out to open the doors. and when vacuum is on the door closes  and th  locking dog  holds the doors open until dog is vacuum released and vacuum is applied to the pot. i do not have a vacuum switch at all so i have to  use closing toggle valves to controll vacuum   . 

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