Looking for good armbar instructionals

[Submission]

Hi guys.
I struggle quite a bit with armbars, I think it's a really simple submission but with a LOT of details to get it, so if any of you knows any instructional that helped you to develop your armbars please share.
Thanks

 

[ThatBJJGuy]

Rigan Machado - The Essence of Jiu Jitsu: Armlocks
Mastering Armbars by John Will David Meyer.

 

[randomg1t]

Mastering Armbars by John Will David Meyer.

this, a thousand times this.

 

[Submission]

Where can I find it? I tried youtube and there's nothing there.
Any more videos would be welcome
Thanks