I tried to use the Pro T Connectors but I have an issue.While the grip of the connector that grips the EMT at a 90° angle holds it tightly, the end of the connector where the EMT enters the end doesn’t hold the EMT securely and it keeps slipping out.Am I suppose to drill a hole in the EMT and insert a screw into the hole that exists in each connector to secure the EMT?Any suggestions?