Malcolm wrote:I nearly posted that video myself, but if I've understood right it means that all the clamping force has to come from a pair of threaded plastic rods. Plastics tend to creep under load, so the clamping force will gradually decrease with time. One possibility would be to use steel threaded rod with a series of insulating sleeves around it. The total length of the sleeves would have to be slightly less than the clamped length of the rod. The spacers would also have to be incompressible, so plastic is out again.
We have used that nylon rod for many years to prevent electrolysis on fishing gear, mounting 200 lb pullers with them. The gear never comes loose. It is relatively easy to maintain the clamping force, by using a 2 or 3 turn lock washer, essentially a spring. Marine aluminum blocks with a high copper content, used with a conducting paste would ensure good contact. There are lots of plastic compounds which do not compress. I expect to see Jack R. build a pack using this method soon.