See-through valve covers - GIF

[NortonDommi]

Wasn't much oil being slung about. There is a Russian Youtube channel with voiceover by BMI Russian for English speakers called Garage 54 that does all sorts of things, mainly for training purposes,(wish I'd had an apprenticeship like that),which is well worth a look if you have not heard of it.
https://www.youtube.com/c/Garage54ENG Click on the videos button to see what has been done. Very interesting even for the jaded.