I am struggling re-setting rear the brakes on a 4 str PB. The space to adjust the out-board (against the brake plate) nuts. a 3/16 Whit fits but there is inadequate spece to rotate th spanner. I have even ground back the spanner, but still do not have enough space between the plate and spring to roate even 1/12 turn.
Interesting post. I had a similar problem when I tried to adjust the rear brakes on my recently acquired PA. I came up with the same solution - cutting down an old ring spanner. I had intended to put this on the forum, but I have not yet got around to it. No need now, but it is interesting that two of us came up with the same solution independently. Photo of my spanner attached