Tonearm mounting centres/info

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Hiya, does anyone have the dimensions for the typical 3-screw tonearm fixing screw layout please? Ideally radius from pivot point (I've assumed a 120d angle between them but please feel free to correct). Imagine marking these on an armboard but you don't have the arm to hand so you have no template, I know the mounting distance from spindle to pivot etc it's the screw layout specifically (radius from pivot to screw centre) that Im after. Thanks in advance.
 
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