Sir drstratton . . . . .
Mah fren . . . .what you have there are three "
TACT" ile , momentary contact pushbutton switches .
Refer to the bottom referenced two vee-dee-yos for their internal construction.
You can buy new or get them as still working units from scrap electronics from the 70's-90's . . .particularly being used on Wee-Cee-R'uhs. . . . ( using Indian accent)
Of the very simplest possible work -a-rounds you might try placing it with the button facing topward.
You then flood the round entry point where that button enters the case with a spray cleaner or WD-40 with your expecting a portion of it to gravity flow on down and get down into the innards and thereby wet the periphery of that convuluted contact disc and adjunct contacts of the switch.
Then use the handle of a screwdriver to moderately " impact tap " directly down on the switch button on upwards of a " hunnert " times, and be expecting that repetetive extra splaying action to progressively micro-abrade away some of the time developed contact oxide. Thus, giving you fresh metal contact point areas then being exposed.
Finally . . . . . . after testing for 100% renewed electrical contact functionality . . . . . you might leave it in the same positioning and respray with WD-40 and add a couple of drops of some possibly already owned . . .household mineral oil . . . . or less readily available . . . silicone fuser oil . . . as was / is used in laser based copy machines . . . or . . . pro race cars use silicone brake fluid.
Or as being a hobbiest . . . . . TRAXXAS model cars and boats also have / use that oil in small vials.
Therewith, you would be expecting the wetted WD-40 to give a merged migrational path to carry the more permanant oils down into the contact surfaces, as the watery thin viscosity WD-40 is going to be ever so quick to dissappear.
OBSERVED . . . . .
If only finding a salvaged short replacement switch, you might have to epoxy on an extension, to extend it out to the length of the other two.
WHAT ? ARE TACT SWITCHES . . .and how-do-dey-wuks ?
Thaaaaassssit . . . . .
73's de Edd . . . . .
I just now wondered ? . . . . . is it permissible for VEGETARIANS, being allowed to eat ANIMAL CRACKERS?
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