inputs.text: defective threading per 35 year ham radio operator - threading defective pl259 terminated antennas would not screw onto adapter two turns turn 4 6 turns using finger torque alone never necessary use pliers vice grip mound plug way onto socket result defect center pin pl259 plug not held snugly inside adapters center socket antenna antenna plugs years screw properly so239 sockets receivers transceivers fault clearly adapter threading even torqued far go slight tug coax allows coax pull nearly 14 inch leaving minimal contact plug pin adapters center socket danger defect less experienced users might not notice becausse feel plug screwed securely onto socket internal pin connection not secure transmitter could damaged result buying 2 pack aweek purchased single unit different vendor amazon problehem reviews users complaint buying kinds adapters favor read reviews adapter sold different vendors know fact kind adapter well known radio electronics chain not problehem cost highter least plugs thread properly guess heading store get couple work