Another way is to go to your local electrical wholesaler
(assuming he will deal with you now we're past Jan 1st/Part P)
and buy one of those chocolate-box-like strips for commoning
up 6mm green-and-yellow to clamp all the wires together.

"Gary V. Deutschmann, Sr." wrote in message
...
I used a cheap pencil flame propane blowtorch and Copper Phosphorus
Bronze brazing rods (low melting point, good adhesion to copper),
affixing each wire to the ground rod.