Have 90 and 91 Camaro coupes, with electric release and pull-down unit. Did not have door keys for the 91, had locksmith make door keys. Wouldn't you know it lift window key cylinder not the same as doors. I am having difficulty separating the key cylinder from the lock release cable. Service manual doesn't indicate any special release procedures. Just "Remove or disconnect, Pull-down unit lock cable connection from lock cylinder". I am missing / overlooking the release device. Help please.