of the tapered threads the head of the pin includes a square or hex hole 52 which is centered and located so that a hand tool can be inserted through the passage 32 and drive the bolt head by engaging the hole 52 as an example through the use of a hex head an allen wrench can be inserted for purposes of threading up the pin the wrench is extended through the passage 32 to bring two adjacent anode blocks 28 into a snug tight and properly aligned relationship in summary the collar 36 is threaded by rotation from the bottom driving the collar in one hand right or left with a spanner like tool which engages the slots 42 from the bottom by contrast the pin 46 is captured so that it can rotate when driven from above through the tool opening 32 with rotation on the opposite hand the pin is driven by such a tool inserted through the drilled hole 32 and the downwardly protruding threads 50 are then threaded into the mating socket threads 34 at the top of the adjacent body this can be repeated on both sides of the body recall that there are two drilled holes and two sets of fittings involved after both have been threaded snugly the drilled holes 32 can be loosely filled with particulate material such as loose graphite alternatively the drilled holes 32 can be filled with packing material such as salt compatible with.