Page 6/7 of the 1972 Chouinard Catalog
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Page 6: A quote from The Black Cliff, Clogwyn Du'r Arddu, Crew, Soper & Wilson.
"One outstanding unclimbed section of the cliff appeared so hard that bolts seemed the only solution: the right hand side of the Great Wall. But it was widely felt at the time (and indeed still is) that bolting this wall would be a terrible desecration of the crag, and represent a threat to the whole delicate basis of British free climbing."Page 7: A description of the Chouinard Carabiner.