I have a Hehr roof vent that is STUCK in the open position, about 1" - 2". I have tried without success to close this vent, to prevent the red wasps from entering occupying the trailer. I have tried to rotate/turn the two handles each resits rotating, and when they do turn the two triangular pieces attached to the outer section turn as well. I don't want to use excessive force and have a situation I cannot reverse.
any and all suggestions will be greatly appreciated.