A lightning protection system for a wind turbine blade with a blade wall and a blade cavity , the lightning protection system comprising: a socket configured to extend at least partly through the blade wall, the socket including a socket body , a plurality of first teeth arranged in a first circumferential array, and a first retention shoulder ; a receptor plug configured to be secured to the socket with the receptor plug disposed at least partly within the blade cavity , the receptor plug including a plug body , a plug conductor at least partly enclosed by the plug body , a plurality of second teeth arranged in a second circumferential array, and a retention tab extending away from the plug body , the retention tab including a second retention shoulder and the plurality of second teeth ; the plurality of first teeth engaging the plurality of second teeth , when the receptor plug is secured to the socket , to resist rotation of the receptor plug relative to the socket ; and the second retention shoulder engaging the first retention shoulder to secure the receptor plug to the socket ; wherein: the first retention shoulder is part of a plurality of discrete first retention shoulders disposed at least partly within a central opening of the socket body ; the retention tab is part of a plurality of discrete retention tabs ; the second retention shoulder is part of a plurality of discrete second retention shoulders included on the plurality of discrete retention tabs ; and the plurality of discrete second retention shoulders engage the plurality of discrete first retention shoulders to secure the receptor plug to the socket . a socket configured to extend at least partly through the blade wall, the socket including a socket body , a plurality of first teeth arranged in a first circumferential array, and a first retention shoulder ; a receptor plug configured to be secured to the socket with the receptor plug disposed at least partly within the blade cavity , the receptor plug including a plug body , a plug conductor at least partly enclosed by the plug body , a plurality of second teeth arranged in a second circumferential array, and a retention tab extending away from the plug body , the retention tab including a second retention shoulder and the plurality of second teeth ; the plurality of first teeth engaging the plurality of second teeth , when the receptor plug is secured to the socket , to resist rotation of the receptor plug relative to the socket ; and the second retention shoulder engaging the first retention shoulder to secure the receptor plug to the socket ; wherein: the first retention shoulder is part of a plurality of discrete first retention shoulders disposed at least partly within a central opening of the socket body ; the retention tab is part of a plurality of discrete retention tabs ; the second retention shoulder is part of a plurality of discrete second retention shoulders included on the plurality of discrete retention tabs ; and the plurality of discrete second retention shoulders engage the plurality of discrete first retention shoulders to secure the receptor plug to the socket . the first retention shoulder is part of a plurality of discrete first retention shoulders disposed at least partly within a central opening of the socket body ; the retention tab is part of a plurality of discrete retention tabs ; the second retention shoulder is part of a plurality of discrete second retention shoulders included on the plurality of discrete retention tabs ; and the plurality of discrete second retention shoulders engage the plurality of discrete first retention shoulders to secure the receptor plug to the socket . <EOS>