Sorry when I said pitch, I was referring to the hole location. The thread pitch I would guess is a bog standard 8mm metric, what ever that is. Although the UK went metric many years ago, I still think in imperial, Whitworth, BSP, BA, BSF are all threads with fond memories of the past when working in a machine shop. Jugging by the method you are going to calculate the hole positions, I would guess that you have some sort of mechanical experience or is that just commonsense.
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