The mercury switch I use is about a half inch long and a quarter inch wide, 
could it not be inserted into the stem of the map light ?
Happy Spitting...................John (in the United Kingdom)
Spit Mk II (1966) in bits..or as some would say (in restoration)
Spit Mk III donor car     ( I am nearly a collector)
Mk IV chassis with all running gear.......(I AM a collector)
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