An interesting examination of the process.
https://www.youtube.com/watch?v=GOY19MGC7u4
https://www.youtube.com/watch?v=Wyk1NQZ9FqM
https://www.youtube.com/watch?v=7YbwDFwF3NY
And this:
https://www.youtube.com/watch?v=XtpMAUf65UQ
https://www.youtube.com/watch?v=GOY19MGC7u4
https://www.youtube.com/watch?v=Wyk1NQZ9FqM
https://www.youtube.com/watch?v=7YbwDFwF3NY
And this:
https://www.youtube.com/watch?v=XtpMAUf65UQ