Thanks for that implied confidence in my demented memory Fulk!
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Heres another one;
One of them, either Clog or Petzl, had a grooved cam, as opposed to the dimpled one that came later, totally useless when they were "cacked up" on a muddy nylon hawserlay climbing rope. I admit I needed assistance to get up a deep mine shaft on the Great Orme because the bloody things just would not grip!!
I hasten to add that it was not a callout, my team had it sorted and the hauling team consisted of 4 admirable ladies and two males, Special Thanks to Liz Taylor for that one!
Forgot to mention, whilst this was going on, someone decided to test how deep the shaft was by the traditional method, even small pebbles make a disconcerting sound as they pass by your ears after about 300ft!
P.S. We entered the shaft partway down through the climbing shaft entrance, I was the mug sent down the bottom half of the engine shaft looking for the sough.