Anony - 7/04/2008 2:15 PM
I almost built one, but a friend bought me one before I got started.
What I looked for:
A light completely encased in rubber below the screw-on top.
The on/off switch was the button type, but completely covered.
The plan was the remove the top, add a gasket/o ring from some caulking or automotive gasket stuff, and then do the same for both sides of the clear plastic top.
Let me know how it works, the store light was 70$ :/