[Healeys] Headlight dipper switch - help!

[CAWS52803 at aol.com]

Recently the little (1") cap/button popped off it's bracket.  This is the 
dimmer switch that controls the high/low headlights on my Bugeye - same as my 
BN4.  I cleaned it up and pushed it back on, but because of the spring, it 
just pops back off.  There is no apparent way to fastened it down.  Even the 
Parts Manual doesn't show any method to secure the cap.  And looking at the 
bracket, there is nothing that appears to be a switch to control the 
headlights.  It is just a solid piece with the 3 wires connected to the underneath.
Any guidance and/or explanation is greatly appreciated.
Rudy Streng
Lenoir, NC
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