Dan I guess I am in the skeptical column. Touching two contacts together will typically cause the spark. There have been posting about using a secondary wire but I don't know of anyone that has done that. As Dave said it is a servicable item that needs to be preflighted and replaced on condition. Just don't dawdle when you plug the contacts together and that will minimize the sparking. Take to long by being timid and you can make it look like a Tesla coil.