On Wed, 16 Jul 2008 20:14:09 +0100, Harry Bloomfield
wrote:

The alternative would be to drill and fill with a small amount of car
body filler from the inside.

One more option, since it's galvanised, is to put a blob of solder on the zinc.
Nuisance if there's rust around the hole, but a nice rustproof metal-to-metal
repair otherwise.

Thomas Prufer