…but due to a Wordpress updating foul-up, Silverbased.org may not be restored for some time. There are some Wayback Machine copies available, but you might need to click around to different dates in order to see all the images.
The URL above refers to the post Film Newbie: Loading & Shooting 120
A related post is 120 Film: Some History
There is some guidance on loading 35mm film in The manual is wrong: Loading 35mm film without pain