hello i used to own several bultacos one off my alpina's had a kill switch problem (i stacked and found the prob) the EARTH was the handle bar the positive was the only wire going to it so in my stack i got a shock from the broken switch!
so make it two wires mate
im sure the brass pegs will work fine but steel and stainless steel pegs will wear better and carry more weigh for longer but then im 90kgs so i need the steel ones