I am using Lmr600 coax with uhf pl259 connectors, the problem is the threaded collar on the connector is fastened to the body of the connector via a brass c clip, the groove in the threaded portion is nearly invisible and the least bit of movement will dislodge the clip and allow the connector body to slide out of the connection. Have anybody had this problem and know of a manufacturer that makes a quality pl259 for lmr 600 coax. This coax and connectors came from Jefatech and they claim I must support the cable better. All cables are in conduit to a panel with lightening arrestors, should the connectors not be able to support themselves within a panel, never had this problem before with other cables. Scannerdweeb.