Funny I was thinking about making those bearings just a few days ago. I watched the video twice and see how they assemble the inner outer races separately and all then push them together.
Butttttt the raceways are tighter in circumference than the balls are in diameter meaning that if you remove the spacers the balls won't fall out, just run together it seems to me. When I go out in the shop today I am going to disassemble one and just prove/disprove the point to myself. Obviously I don't realize something because they do push them together and do it billions of times a year for 100s of years!!!!!!
Other thing is how many processes and sophisticated low tolerance machines are required to produce one bearing and it sell at retail for $10, like for a 6302 for example.
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