Here is an old video of Dustin from Gatku explaining one way to do it. I have seen it done but never tried myself. I don't personally have the need for it. I just use a solid ring or spectra loop on my band and clip my floatline or belt reel to that. I guess if you are shooting large grouper that will hole up it could be useful protect your spear, but I always attach to the band and let the spear go.