is there a way to make an open and closable door using a grzv lift technique lik this? technique: door starts closed with an unspawned grav lift A next to it is grav lift B spawned and preventing grav lift A from spawning. now by destroying grav lift B GRav lift A spwans and pushes door up. and by destroying grav lift A Grav lift B spawns and the door closes now ive tried this and every time i kill a grav lift the ohter doesnt always spawn. for example: i kill A , B spawns but i kill B but B spawns again and again and again until finally A spawns after 3 consecutive B's so i was wonderin if there was a way to make it force spawn each other