On Mon, 30 Jan 2012 09:05:34 +0000, Tim Lamb wrote:

Yes empty a can of squirty foam into it and wait, just like the
tea
leaves do before breaking in...

Something to be said for fitting the sounder box out of easy reach.

Q) Is 20' above the ground in the middle of a bare gable end wall
"out of easy reach"?

A) No, that's where the sounder for the local Co-op is but it didn't
stop it getting filled with foam a few years back. Open area/car park
on Front Street in plain view with commercial/residential properties
all round.

--
Cheers
Dave.