[Milsurplus] [Boatanchors] Mica compression trimmers?

[KD7JYK DM09]

> I believe your observation is wrong. Mica compression trimmers indeed do 
> have mica between the plates, so the compression is on the mica and not 
> air. Consequently you can obtain a higher capacitance for the same size 
> as the dielectric constant for air is 1 and for mica it is about 3 to 6. 

And here I though rock didn't compress, and only the air-gap between the 
plates was changing relatively electrically, until the plates stopped. 
I do however, recall a saying of squeezing blood from a stone, so maybe 
that's how they work, but I can't imagine it designed to shatter 
eisenglass, bend plates, strip screws, and crack the body, for that last 
little uuF.  I figured the mica was the dielectric to increase the 
operating voltage...

Kurt