In reply to Stephen Reid - Needle Sports:
Also interesting how the clues for this instability were always there.
Several reports in recent years of damage to Zig Zag .
The rock on the traverse of OB just after the ramp has always been shattered as if damaged by the compression stress of The Block above, since I first did the route in the early 70's.
Wonder if Matheson Avenue was only first climbed in the 70's because it was not so obvious in the 60's ?