This video isn’t about kintsugi but kasugai, staple repair.
I bought an antique, large, Chinese bowl that already had 15 staples in it but 3 were missing. I am going to replace the staples and since the holes are already there for them I just need to make 3. This video shows making one, I have already made the other 2. I use a round file in the video since my flat file isn’t very sharp. I am making the staples about 1/10th. mm smaller than the width of the holes to account for heating and contraction.
For more on this process and other steps for traditional, lacquer based kintsugi, see