"Oren" wrote in message
...
On Thu, 07 Aug 2014 10:45:11 -0400, "Percival P. Cassidy"
wrote:

..

BUT neither the electronic stud finder nor the swiveling-magnet nail
finder will locate these screws.

I know that fancy and expensive devices exist that are claimed to be
able to find nails in lumber, but is there some simple and cheaper way
to do what I need?

Perce

If the screws are not brass you might try rare earth magnets.

I was thinking along the same line. Maybe one of the magnets out of an old
hard drive. They are strong enough to penetrate a short distance.