Created by Sheffield blacksmith, John Brailsford, the MOAC was one of the first ever purpose designed nuts for rock climbing, (the first being the Acorn – also invented by Brailsford.) Chockstones and machined nuts were the norm up to the point when MOACs first appeared in 1962. The first batch were cast in Manchester and finished by Peter Gentil. At the time a guy called Ellis Brigham owned a chain of outdoor shops in the UK which had an import section called Mountain Activities and the first two letters of each word were used to create the name of this new nut – the MOAC – as Brigham had backed the first production run as a financial gamble which seemed to have paid off because millions must have been sold and fifty years later (2012) climbers are still using them. Early versions were more rounded at the four corners and there were smaller production versions later on. They could also be filed down to fit smaller cracks.