Here's a piece of ham radio history. This is a 100pF condenser with the bent plate to short out the tank. This was trick in the 40's someone had a beam-power triode (like a 6L6 or similar) used in a tri-tet oscillator. To avoid destroying the crystal when running on the fundamental you would short the capacitor making it a straight tetrode oscillator. You can see this in some of the pre-war handbooks. Pictures show max and min C along with the shorted resistance.
I'm sure you can bend it back if you don't like that feature :-)