Chris Green wrote:
I'm looking for some small switches that I can mount on a surface,
i.e. on flat walls (mostly wooden panels, possibly metal in a couple
of cases). They can't be mounted in a hole at all because the other
side of the same panel is also an 'outside' surface.

They don't need to be safe for mains, they are only switching 12 volts
at quite a low current (LED lighting, maximum an amp or so).

I assume you want locking switches, ie not push buttons?

How about a conventional rocker in a wooden surround? eg
http://onecall.farnell.com/marquardt...i-o/dp/1839501

Just take a piece of wood of appropriate thickness and drill out the
necessary hole to flush-mount the rocker, and use that as the surround - sort
of like this:
http://www.ebay.co.uk/itm/Pine-Pattr...-/261152834593

Slide or non-latching buttons can go a lot thinner. Even the SMD switches
can be mounted on something.

Theo