Note: the "speed-stringer" part with the barb is usually attached to the float, as shown below. You unclip the speed-needle from you gun (the main weakness with the system I think) and use that to thread the fish. Clip the gun back on the line. The fish then work their way up the float-line as you swim and eventually get trapped by the barb/flopper near the float. Neat, provided the fish don't break on their way up the line or thereafter (the other potential weakness, for example grey mullet have a reputation for breaking off of stringers).
Source threads: http://forums.deeperblue.com/spearfishing-equipment/76575-speed-stringers.html#post697411 & Speed stringer? - Spearboard.com - The World's Largest Spearfishing Diving Boating Social Media Forum
BTW You don't need a solid float like that for UK waters. I have an RA one, like that above but with the optional diver flag & (internal) ballast, but hardy used it and haven't used it for some years. My brother has something v. similar, a safety/rescue buoy - never used it & he would probably sell it if anybody is interested) - they are really intended for very large fish, often when fishing from a boat (so you don't have far to carry it) and often used in pairs with bungees and/or breakaway rigs. For the UK, I would recommend that you instead get an inexpensive torpedo-style float with a decent sized built in dive-flag that can be blown up by mouth, rather than requiring a garage/foot-pump - they are very light & easy to carry, and can be inflated & deflated quickly, they last surprisingly well and can be patched.
Source threads: http://forums.deeperblue.com/spearfishing-equipment/76575-speed-stringers.html#post697411 & Speed stringer? - Spearboard.com - The World's Largest Spearfishing Diving Boating Social Media Forum
BTW You don't need a solid float like that for UK waters. I have an RA one, like that above but with the optional diver flag & (internal) ballast, but hardy used it and haven't used it for some years. My brother has something v. similar, a safety/rescue buoy - never used it & he would probably sell it if anybody is interested) - they are really intended for very large fish, often when fishing from a boat (so you don't have far to carry it) and often used in pairs with bungees and/or breakaway rigs. For the UK, I would recommend that you instead get an inexpensive torpedo-style float with a decent sized built in dive-flag that can be blown up by mouth, rather than requiring a garage/foot-pump - they are very light & easy to carry, and can be inflated & deflated quickly, they last surprisingly well and can be patched.
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