Hi Andy,
I like Piranha nuts because they are a LOT easier to do up then those thin locknut things, but as they hav only got a squitty little thread in the side, i do not see how i could fit a suitably sized, robust, flylead. It seems to me that the only connectors i could get to fit them would be them little weedy little insulated crimps!!
So, rightly or wrongly, I like to use the uninsulated crimps with a flylead the same size as the incoming cpc, or, if the incoming cable is only very small, i would just use a bit of 10mm earth cable as it is a lot more robust, bolted to the 6mm HT bolt that i use to bolt the banjos!!
john..