bit of an old thread.. but these are not anything more than to increase grip druing the throw at a later date than the time it was made.
if the maker was the primary thrower they woudl have just adjusted the hape for their grip,
you can see little knife marks on clubs , karlies and boomerangs for improved grip many times.. also some boomerangs are thinned down at one end by the thrower at a later date.. so the original owner made it one was and the new owner found it to wide or slippery.
lots of old throwing clubs will have scraping, patterns our gouges on their pommel and lower portion of the grip to allow more control when thrown too.
aborigines liked throwing stuff , almost every manner of weapon or tool can be thrown at some point..and i guess what throws well for one person might not feel as good for another.
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