The steel ball bearings can be machined on his lathe, even if they aren't very precise, it's not a big deal.
At worst, they can be replaced frequently.
The time to grind the steel balls has to be calculated in days, fourteen pieces take almost half a month.
Life passes by like this.
Thus, he aged by half a month.
But he didn't have much to say.
From his point of view, they were quite well-rounded.
Then, grinding each steel ring took another day each.
Putting the small ring inside the large one, he found a huge discrepancy, the gap width was inconsistent, he felt like dying.
He still didn't know which particular ring's shape was not standard.
Inserting twelve steel balls into the gap, he could see that their shapes were equally substandard.
He didn't know what to say.
Inspecting them one by one.
Trying to slowly rotate the inner steel ring, observing the connection between the two steel rings and the twelve steel balls.
He placed the finished cover on top.
