Couldn’t find any useful info out there (including forums and Shimano instructions) but lots of people asking for it so here it is.
This is for the Shimano HG40 Narrow 6-8 Speed chain, that comes with an odd connection method in my opinion, involving bending the chain in (a lot) with your thumbs, then bending it back the other way until it makes a loud snapping sound.
I had a bit of trouble mainly as I didn’t want to damage the chain, however once I let go of those worries and really went for it, the loud SNAP when it connected assured me that it was an adequate and intentional connection.
NOTE: You should hear a much louder snap than the one in the video, as this is the second time I connected it and it must have lost tension hence the barely audible snap/click sound.
Post time: Jun-28-2017