![]() The plug ferrule, when torqued down, was tight to the point of not turning in the barrel of the jack. ![]() The thumbscrew cap expands the ferrule to a tight, very tight, grip in any banana jack I tried. If using smaller than twelve-gauge wire, you will have to double, or even triple fold, the wire-end, and tin it into a solid mass to ensure the setscrews get sufficient purchase on the wire for a reliable connection. A tiny Allen wrench is supplied with each pair of plugs. The plugs can accept up to an 8 AWG wire in the machined barrel, and the wire is held securely by two bass Allen-head setscrews. The hole in the twist-cap is the entrance to the milled-in socket in the “spike” that allows additional banana plugs to be conveniently stacked onto the connector. As the cap is twisted, the spike expands the ferrule, “locking” the banana plug into place. The caps are press-fitted to a central threaded and tapered brass “spike” that extends into the split ferrule of the banana plug. The locking mechanism is capped with “color-coded” polycarbonate caps in red and black. The brass is then covered with a polycarbonate shell to protect against the possibility of catastrophic short circuits. A magnet confirmed they are indeed non-ferrous. Construction and Design The Parts Express plugs are constructed of solid milled brass plated with 24 karat gold.
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