I researched the knot further and eventually figured out how to tie it myself (you can view the video right now at The power snell is your basic snell knot, but with the addition of a wrap of non-loadbearing line acting as a cushion between the loadbearing line and the gap in the hook eye where it is bent over on itself
Bill Amberg cut his teeth as apprentice craftsman before opening a leather studio in Rotherhithe, London in 1984

The current models of glass blanks consist as follows from left to right CARBON FIBER BFS BLANKS 4ft 11 3 piece 1-5g natural carbon gloss (can be shortened at the butt all the way down to 4ft 1) 5ft 11 1-6g 3 piece natural carbon gloss (can be shortened at the butt all the way down to 5ft 1) BAMBOO CANE BFS BLANKS 4ft 1 piece 2-8g ( can be shortened or made longer - 4ft 8 with a detachable handle) 5ft 2 piece 2-8g with nickel ferrules FIBERGLASS BFS BLANKS (FIBREGLASS) 5ft , 2 piece black fiberglass, 1-5g put over joint ( slightly lighter that 3 piece spigot joint as thinner walls ) 4ft11 , 3 piece , spigot joint 1-5g lure rating , amber , can be shortened from the butt section down to 4ft 1 (or anything length in between) 4ft11 , 3 piece , spigot joint , 1-5g lure rating , white , can be shortened from the butt section down to 4ft 1 (or anything length in between) 4ft 1 , 3 piece , put over joint , 1-5g , olive 4ft 1 , 3 piece , put over joint 1-5g , white 5ft 6 , 4 piece , put over joint , 1-6g white 5ft 6 , 4 piece , put over joint , 1-6g olive

Most 12-pound lines are closer to 16-pound or 18-pound test
Weather changes on a dime