I find the Hawaiian sling is better for going after fish
in an open environment
as you can shoot from further. However it takes both hands to operate so when going after fish under a coral head
I switch to a pole spear which is a one handed affair allowing my other gloved hand to steady myself when reaching under the head
As for how many spares you need, like previously said it depends. I have never purchased a spare but my stash of spares continues to grow as I find other people's lost
spears all the time.
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