There have been a few requests for this topic, so let's have a go at it, shall we? Maybe @PNSSHOGUN, John, could create a Primer with the basics? I know this is out of the blue, so no worries if it's not possible at the moment. I will browse previous threads for useful info and link them here, in the meantime.
I'll start with this chart created by Ernie @Stegel. Lots of detail, so might need to zoom in for specifics.
Tassel Examples - Ohmura Website
GENERAL GRADE TASSELS
Generals Rank Tassel - Paul G
Generals Tassels - David Flynn
NAVY
Legendary Zig-Zag Stich Kaigunto Tassel - PNSSHOGUN
Unique Metal Tassel End; Navy Tassel - PNSSHOGUN
"LATE WAR" ALL BROWN TASSELS
All Brown Tassel for Gunzoku - Nick Komiya, Warrelics
Breaking News on the All Brown Tassel - Bruce Pennington, NMB
NORTH CHINA RAILWAY POLICE TASSEL - BROWN/TAN
Help With Blade, Tassel, and Fittings - Michaelr
NCO LEATHER TASSELS
Another Leather Tassel Question [has some manufacturing info] - John C
MISCELLANEOUS
Cut Tassel Discussion - DWMC
KYUGUNTO SWORD KNOTS
These pages are from Dawson's book.
{Posting for now. Will update as we go. Please feel free to post links or items that would add to the educational value of the thread}