I had great trouble sourcing this nut for my ’36 MAC, even eventually sending it to a well-known stainless nuts and bolts manufacturer to copy…..he kept it for a month then declined to take it any further saying he was “too busy”..
Another VOC club member took pity on me and sent one gratis; it was a new repro in stainless, complete with the steering damper dimple correctly machined. He had a spare as he’d had a small batch commissioned and had one spare remaining, so clearly there’s a shortage.
