Very old and rusty balance restoration

In this video you will see the restoration of a very old scale that was missing the plates and was very rusty, I made the plates as it would have been done in the past trying to recreate the technique the best I knew, I hope you like it or at least entertain you.
Story :
Origin of the balance
In the origins of civilization the usual method of trade was exchange. For example: for a certain amount of corn, I can give you a certain amount of wheat.
But how could they determine the amount? By eye it was a bad system that always ended in arguments, so another system had to be found.
And the system had to be an instrument that allowed to measure the weight of objects in an objective way or in comparison with other objects. And that was solved with the invention of the balance.
Who invented the scale
The inventors of the balance were the ancient Egyptians, who already left engravings representing scales in temples from more than three thousand years ago.
In a grain-producing people like Egypt, the need for this instrument was obvious.
The first scales in history would not seem very strange to us: a horizontal bar that hung from a rope and from the ends of which hung, related to more ropes, a pair of plates. It is called a cross scale or pan scale.
when was the scale invented
That did not allow to quantify the weight, but it was perfect to compare two weights. In any case, if a pre-established weight was placed on one of the sides, a kind of quantification could be started.
Those primitive scales were improved over time, with systems to ensure that the apparatus was level and, above all, with a needle placed in the middle that indicated which way the weight was inclined.
This same type of scale was used by the ancient Greeks, who also made it the symbol of justice.