On Mon, 14 Dec 2009 15:33:03 -0800, Prof Wonmug wrote:

The hole is at the top, about 2" below the cap.

It was mentioned the hole is likely for a photo-cell.

Find a dummy plug to plug it up!

1) whittle a tree branch down and make a wooden plug.

2) use a wine bottle cork and plug the hole

3) duct tape