Firstly, I like a sense of humour!! Back in the very old days of Valve/Tube Radios, circuits often used what they called a 'Grid Leak Resistor', (beyond the scope of the discussion here). Here's a typical Circuit showing one, (and it's Cap), circled in red......
https://i.imgur.com/WGntwrN.jpg

They were typically mounted in a spring-loaded mount, like some fuses are. Here's one with the Capacitor underneath......
https://i.imgur.com/5Ag9JCH.jpg

They are usually a few Meg Ohms, and mounted as such for easy changes to other values. Something that is purely a novelty though, is that you can (could!) get Drip-Trays for them, as they are 'Leaking' hahaha. I want one, just for fun nostalgia!!!! Here's one!!......
Image Link
(I was trialling an in-line image, above! Sorry if it didn't work).

Secondly, just for nostalgia, in some very old radios, instead of the typical variable tuning condensers, as in......
https://i.imgur.com/JNHttcb.jpg

Some of my REALLY old radios used what's called a 'Book-Capacitor'. Where there are fixed plates, and using a Cam to adjust the Dielectric, (gap between plates), to alter the capacitance!! There's not many of 'those' around!! Here's one......
https://i.imgur.com/pV0W2eE.jpg

Sorry people. I'll have 'proper' questions and queries shortly!