Perhaps shrink wrap or the cable's insulation is blocking the full movement of the outer part of the RCA. I had this happen once on a Mapleshade IC (the plastic insulation was in the way).
RCA plugs that don't fit.
I've had problems with numerous interconnects lately that have WBT or WBT style locking RCA's. The connectors have been so tight that they won't fit on the jacks on back of my eqipment. This has happened on various types of equipment, and my only solution has been to unscrew the barrel of the connector and attach the cable without it. Has anyone else had similar problems and is there a solution I'm missing. The most important thing is not breaking the connectors on the back of my equipment while maintaining a secure connection.