Maybe I'm not the first to invent this -- then again maybe I am.

Joy's Recycled Clever Snail Trap

Take a cd spindle with clear plastic cover that locks on.
Take cover off.
Cut a snail-sized doorway in the plastic cover, at the bottom.
Place snail killer on the base bit.
Screw plastic top back on.
Place, right side up, in garden.

The trap stays dry and away from birds, pets and reptiles.

Cheers, Joy