Manpa said:Eldorado, does the knurled knob on the right hand end of your picture come out with a spiral main shaft or is it solid, the same diameter as the outer shaft?
Not my find Nightjar but here you go.Nightjar said:Eldorado,
More photos at different angles may help.
Particuarly what is hidden by your thumb.
Nightjar said:Still think it is an electrical device?
When the plunger is pressed in the two tangs would make contact?
Real mystery...
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