Craig i am afraid the theory about a slack clevis only applies to a straight master cylinder not a servo. the rod with clevis you refer to only reaches as far as the back of the servo and is held by a circlip. the rod protruding from the front of servo into your master cylinder is part of the servo mechanism and has its own back stop. to take up differences in tollerances that fron rod is normally adjusted at factory to take account of the clerarances no the master cylinder fitted to the servo. if yopu have a very hard brake pedal which gets worse on driving still suspect the preload. this can be double checked if your brakes lock up by opening a bleed valve, the brakes will release .
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