... Had the same problem,..and yes, it was a "U"-tube... when I lowered the lens down,and just lightly touched the bulb,..it came on,..shut it down,and tried to turn it back on,..nothing,..put my fingertips to the bulb,and VOILA,let there be light,...very strange..could it be a stray static electric discharge phenomenonmenem??
Flustered!!!
Russ
