I am enquiring about the Entladtungzunde 44 SF3 anti lifting device, i want to know if the rubber cap which has a raised tit on the top is a hole or a sealed part. It seems that the picture missing the rubber cap showing the safety lever which pulls aside holding the arming pin held in place would protrude out the top of the rubber cap with a metal washer in place so the safety lever pulls aside easier. This arming pin held in place is a pin that breaks a glass vial which in turn disolves a pellet that arms the striker retaining arm