| Hi Rudy,
The central shaft comes through the cap and is peened over, much like a rivet 
head. As Peter said, this gets worn over time and the cap pops off. The central 
shaft goes through the body and is what activates a switch near the bottom 
(inside where the 3 wires attach). 
If you want to try to 'repair' your original (which is probably a better 
quality switch than the aftermarket) you could drill and tap the central shaft 
for a small machine screw.
BTW, same thing happened with my Lucas switch but I found a NOS switch to 
replace it. I kept the repaired original as a back up.
Cheers,
John
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