In article ,
Dave Plowman (News) wrote:

Not enough room. The mirror is glued to a back plate which has a
cutout for the heating element and that cutout is only about 1mm
deep. There would be room for resistance wire, but making such a
thing doesn't appear easy. While etching a PCB type will be - if
I can find a source of the material I've mentioned.

Sounds like a bit of a no-hoper Dave. All the cars
I've had recently have heated the wing mirrors by
piping some of the warm air from the passenger
compartment vents, through the door, and out behind
the mirror. Would that be an easier mod?

--
Tony Williams.