On Sun, 24 Nov 2013 08:43:46 +0100, Thomas Prufer
wrote:

Sometimes works: Solid, thick block of wood, placed against most of the length
of the wood partition. Smack wood block with hammer.

I realized that this is unclear just after sending... the smacking is parallel
to the glass, i.e. the thick block of wood is pressing outwards from the middle
of the pane.

Thomas Prufer