Drum brake seized... Please help!
I'd try Oklas 1st suggestion again.
Here is a pic of a later model (automatic adjusting).
I just did a 69 Runner the other day and it didn't have the 1 way adjuster wheel either.
the notches were the same going both ways and had a spring that rode on the adjuster wheel. (non automatic adjusting)
Not sure if the differences are year, model, or options driven.
Like Ok said, try to get a thin wire, coathanger or something to hold the adjuster Ratchet away from the wheel and then you might be able to turn it back with a brake tool or screwdriver.