the strap by an elongated rivet 34 extending through a conforming opening 36 in the cover 30 a conforming opening 38 in the base 32 and a conforming opening 40 in the strap 14 the grounding contact 28 is positioned within a receiving opening 42 in the housing and receives the grounding blade 44 of the plug 12 to make contact therewith referring next to fig2 it will be evident that the grounding contact 28 is assembled to the bottom portion 20 of the strap 14 by mounting of the contact 28 onto 20 and by inserting a rivet 46 through the respective openings to attach the contact to the base the rivet stem 50 extends through opening 52 in base 20 and through opening 54 in contact 28 until the rivet head 48 is flush with the bottom of bracket portion 20 and the stem 50 is then headed to form head 56 as best seen in fig1 the contact 28 is provided with a tin or indium coating which is preferably formed by electrodeposition of a tin or indium layer on the surface of the contact 28 the tin or indium coating is put onto contact 28 prior to the rivet attachment of the contact 28 to base 20 of bracket 14 it has been found that where the contact 28 is.