Folks, I am attempting to upgrade my 1983 300D (W123)'s sound system, and while messing around with the driver's side speaker hole, I have some how loosened up the AC hose and litle valve. It looks as though there is a chrome ring that faces the driver, then some sort of corrugated washer, and that chrome and black ring some how fits into the little valve control that is connected to the AC hose. How does that all snap back together? Thanks so much in advance!