Kerry F2-Titanium H/W counterweight DIY>?

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I'm thinking of machining my own version of this titanium counterweight but need the dimensions. Does anyone know them? I need the width, circumfurance and how far the hole is offset from the middle or the edge at least. We allready machined an arm stub out of Brass and it is quite heavy. Too heavy to be used with another heavyweight which weights 140g. At that weight the tonearm almost balances evenly on a RB250 and AT120e cart.
Also does anyone know the weight of this Kerry F2 counterweight?
 
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