Last week I suggested that lightning-stopper bottle users have well-developed thumbs. It’s not really like that. Your thumbs aren’t strong so much as sore if you bottle like I do.
I use a pretty basic, low-tech process to fill bottles: first I fill with a spring-loaded bottling wand which allows me to efficiently fill one bottle at a time
and then I manually set each stopper (though I use both hands).
It’s great for the pico-cydery scale I’m at, but I always wonder how the industrial producers do it.
Fortunately, a European soft-drink company produced this
I’ll bet their thumbs are normal-sized, but their index fingers are buff from all the button pushing.