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I often just wrap a bungee we use to keeps tanks in place on the boat to the mares avanti tre fins, works great.
Why do you need the buckle and rubber strap?
And if you are using spearfishing rubbers get the ones for pole spears as they will be cheaper and easier to add to those bungee extensions (use a constrictor know to keep them on.)
I didn’t realize the threads were the same. Good to know. Thanks!