i was taking photos of it for an article i've written about bowfishing sharks.
just thought i'd show it off.
i found a bolt that screwed into the stabiliser bushing and i brazed it to the male part of a clip on air fitting. the female part is on the spool. the spool is just a simple handline, $5 from the tackle shop. it's clamped between 2 plates. i also just glued a piece of rubber with a slit in it to hold the line from coming off the spool before shooting.
the air fitting idea allows for quick detach of the spool from the bow if needed. handy for travelling and for when you get a bigger fish.