Stopper ring, I used 42 kg bleeding leader wire so when I connect my mine leader line from my reel I can join the bleeding leader to my main leader of 1 mm with a normal double Blood Knot
Pic 16 all done, I know my slide is a bit short but it is all I had. I have tested the strength of the slide and gave it a pull as hard as I could with the hook hooked to my balcony and believe me it is mega strong.
I have about 15 other slides made the same as yours, it is just this wire is to thick to make the needed knots, nice shark mate....mine will come one day...cheers.