Actually, they are quite clever. There is a spring controlled ratchet inside the main lever arm which acts as a self adjustment mechanism. Once fitted and checked against a disc a split pin locks the control screw. From that point on if there is excessive wear on the handbrake pads the ratchet will tighten up the self adjust nut ensuring optimum contact pressure on the handbrake. That's the theory.
I've tested the mechanism to ensure it's working as these things become virtually inaccessible once fitted to the car.
Dismantle and inspect
Clean and etch
Paint and bake in the oven
Re-assembled with internals thoroughly greased
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