> BTW, you may find a 50mm diameter ball bearing, but will it weigh 500g
> +/-25g? And then you'l have to drill and tap it for an eyelet for the
> string.
The impact ball spec was written around a 2-inch diameter
ball bearing.
Drilling and tapping the ball bearing requires some sort
of arc-drilling equipment (because of the hardness of the
ball bearing).
Best regards,
Rich
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