TW is an average of six or so frames. Most others measure one.
So all the figures given are plausible, The data of tw university, i think, relates to just one.
The bottom line is that you could choose a swingweight from tw, but for most people it'll be a lucky dip.
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Every government has its secret service branch ... A messy job? Well that's when they usually call on me ... Oh yes, my name is Drake, John Drake.
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