He must find more things to do for himself, assembling such a device continuously. Since it has been unqualified for a week, he shouldn't get fixated on it.
He needs more practice with his hands.
For example, he wants to make those bearings with steel balls.
They would rotate very smoothly.
He can make them, but the far end of the shaft would wobble incessantly.
Anyway, give it a try first.
Two steel rings, with a bunch of steel balls sandwiched in the middle, how are they connected?
He doesn't have welding skills.
He resorts to the clumsiest approach, wrapping them with an additional layer of iron to hold them together.
Steel balls can be crudely cast and then hand-polished.
He has always disliked the task of hand-polishing steel balls.
It takes more than a day to polish one steel ball.
The roundness relies entirely on eyesight.
