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I bought a cheap version of this machine, because all decent ones had costs of hundreds of dollars of transport to my region. The machine seems to be made of solid parts, but is really badly assembled. I hope to reassemble it into a working state. This is how it should look like:

enter image description here

And it is the photo of the worst part of what I bought. My question is about the brass (?) nut:

enter image description here

What is the role of the nut? Why it has something which looks like a small ball inside? Should it be put in the position, in which it is in every other photo of this machine?

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The image shows what is often known as a zerk fitting, aka a grease fitting. The ball seals the passage from the outside to the internals which require grease.

A grease gun with a properly sized connector will snap onto the zerk fitting. The gun is used to pump grease under pressure to the area described in the image as "no space, grinds," likely removing the grinding.

Pump grease through the fitting until some appears, then wipe off the excess.

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