Well, I either missed or forgot this topic, so: better late than never.
We used to use the "Russian Sennit" as a strip covering, a belt, a gunn'l cover on a gig or an Admirals Barge and the way I learned it (from BM1 McKinnon, RIP) was the same as in the Boatswain's Mate 3 & 2 training book from the Navy,
https://babel.hathitrust.org/cgi/pt?id=uc1.b4256978;view=1up;seq=9[/url]. that takes you to the book itself... see below for the sennit instructions themselves.
I got lucky finding this when queried on it by one of the respondents on my tutorial pages (as, after seven months, my dear wife has YET to grant access to my book library which resides BENEATH her sideboard, dining table and an enORmous amount of crockery boxes "in storage". (Seems anytime I go looking for something, it's always, "In Storage".)
("NO! Don't move that, I'm not ready to move it yet!"
"But I only want a few books from underneath..."
"NO! You'll move things and then never put them back again and..."
Well, she's right, y'know...)
Anyhow, there's the page for this and note that the Mat referenced in the post above for Mr. Smith's book is a mat, not the sennit. Still nice when done up, but this one's purtier! Groups of four and a lot of eyeball.
e.t.a.: Also have Pat Spierling's KHWW tutorial and the relevant BM page on my website.
http://www.frayedknotarts.com/tutorials/RussianSennit/RussianSennit.html