Here’s a good video (I checked several; this one seems best) with demonstrations and explanations of how it used to work, and how it works now https://youtu.be/

Here’s a good video (I checked several; this one seems best) with demonstrations and explanations of how it used to work, and how it works now https://youtu.be/JWdr4zeE3JU https://youtu.be/JWdr4zeE3JU