you also want to look at the part that the dog bone slides in ,that actually moves the dogbone,,the two I have are both worn.
I have just done a 3 week job on the brakes on an early A brake system, One huge amount of work to get it to work properly, but its now really nice,
started at the brake pedal shaft, and worked from there.
3 days solid work on the lathe making shafts and pins etc, you can buy some parts so they need reclaiming.
Lawrie
let me know if you want some pics
Law