On Jul 16, 8:14*pm, Harry Bloomfield
wrote:

Drill a hole through the (er..) hole. Find a nut, bolt and a couple of
washers add a couple of rubber washers (tap washers?). Better if all
these are rust proof/brass or etc..

Brass is the last thing (other than copper) to be in contact with
zinc. Make sure they are completely electrically isolated.