To reduce the chance of switch failure, mount the switch inside the model, and have a hole drilled in the side. CA a piece of music wire in the hole, and have about 1 cm protruding out the side. Therefore, there is no pressure on the switch (common cause of failure), and it looks way better then having the entire assembly on the outside.

Never had a switch failure with this setup - mind you, pilot error always seems occour before anything has the chance to fail!

Thank you,

Graeme