It enables you to lower the front outer pivot ball height by approx 3mm - by skimming the shoulder and grinding it flat with the remainder of the block.
On high grip tracks like many of the ones over here, this helps reduce some of the front end bite (a reversal of lowering the inner pivot if you like).
You can always shim the pivot ball back up to standard height but you may need longer threaded balls to do this since 3mm of the material they otherwise screw into has been removed.
Hope this helps
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