On Mon, 18 Sep 2017 20:29:46 -0700 (PDT)
"Gramps' shop" wrote:

Thanks. Actually, it was a 1 inch deep hole about 1 inch in
diameter. Filled it with some of that expanding foam. Hole plugged
and we'll see if that pecker come back.

make sure you cover it with paint because that foam usually breaks down
under uv light

now i wonder how woodpeckers sense the density of the wood

do they just peck randomly until they find a soft spot

if they do they might just find that foam spot and also find it
suitable for storage