I had to remove a 600+ lb torqued crank pulley bolt of my Acura Integra (not kidding, the factory idiot robots way over tighten them, it's sort of a well know f up).
Was kind of like some posters said here. And I tried everything, WD soak for days, hitting it with a hammer to break seal, Impact gun, heating it with a torch etc etc...
What finally did it, was, 3 people, putting the 5speed manual in 5th gear, person 1 stomping on brake. person 2 (me) holding the ratchet setup with extension and a 3 foot cheater bar squarely on the nut, person 3 (bodybuilder) could not break it but then used his legs scissors style on the cheater bar while hugging the frame of the car (was jacked 3 feet in the air). That finally got that little bitch out of there.
I do by the way only have one mode of transport here, my moto, so when repairing and it's down - well, I feel your pain.
So on to your problem.
the % symbol means to place a bolt in one of those holes, and the line in the symbol means put a bar that goes between the bolt and the ratchet / socket. Sounds like a very clever idea. in the % one • is the bolt one • is the ratchet head and the / line is the bar.
Then you can torque one of the elements using one of the other elements as a brace to pull against, and the other on to prevent there crank from spinning. Brilliant idea. I was wondering if those holes could be used somehow to your advantage and I like what he posted.
When I removed parts of my CB here and also removed my stator in my Kawasaki, the case cover comes off, yes? And then that rubber parts slides out allowing the wire to come out. My CB 400A area was dry (no oil) but my Kawasaki ZX6 stator cover area is wet (oil is in there and supposed to be). So for the Kwawk, you use a smear of Permatex gasket sealer on the faces of the rubber to make it sealed. The rubber compresses a lot and on the Kawi it's not high oil pressure or much oil in there, and it's been fine for 1.5 years and 7000 miles.
The CB400A should be even more mellow as I think that's mostly a dust / grime seal, I don't think any oil circulates behind there.