Abstract: A sleeve for assisting a cylindrical door closure for maintaining a door opened. A door closure made of a cylindrical barrel with a rod slidably mounted in the member is known to have a hold open washer for locking the rod relative to the barrel. The locking takes place when the washer is tilted on the rod and the edge around the hole pries on the rod. When the hole in the washer does not perform its locking function, the new sleeve is mounted over the end of the barrel. The sleeve has an end wall which abuts against the end of the barrel and is provided with a central aperture for allowing the sliding of the rod. The end wall is made with a greater thickness around the periphery to increase the angle between the washer and the rod so that the prying effect takes place between the washer and the rod.