Two other Henselt contributions that seem to have passed unnoticed (at least by me) :
https://www.youtube.com/playlist?list=OLAK5uy_lsZfuJcuHcWzG83zRlfoRr8VP3Le87_ks
https://www.youtube.com/playlist?list=OLAK5uy_mr-LhzJ9MhzqnXix0670SqruWi20is6Z8
Thanks for pointing these out.