I've tried everywhere I can think of in Brisbane, and everybody says they don't sell 40mm sockets. They only have 38mm and 41mm because those sizes overlap with imperial. I bought a 41mm socket from Supercheap Auto which fit well enough onto the nut for my Citroen C5's wheel bearing, but because it was an impact socket, the wall thickness was too big so it wouldn't fit into the wheel hub.
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So does anyone have, or know where to buy, a non-impact 40mm socket?