I just got a hold of a John W Hobbs underhood lamp. When I tested it , it worked but at a very high angle (held it with my hand) once I mounted it, it will not turn on. (Lower angle? ) Do the Mercury switches go "bad" ? Can I get a replacement one? (When I searched, I did not find anything close to the one I need) Any information would be great. It looks great but if I can have it working correctly I'll try . Thank you. Todd