video was quite entertaining, music was nice, but it did leave me with just one more question. After the marble itself is completed and is still attached to a piece of glass, how do you remove that final cylindrical piece without there being any rough edges to the marble itself? Do you just saw that last part off and finely sand down the remaining glass nub, or is the video not showing us that final crucial step for some other reason?

thanks also for your prompt answer before.

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No one was left who could remember how it had happened; how the world had fallen under darkness.
At least no one who would do anything.
No one who would oppose the robots.
No one who would challenge their power... or so Dr. Wily believed...