Best setup I used so far, have it on my own boat.
Just stitch a small block to the underside of your trampoline to the rear of the snuffer back.
Above the trampoline run the retrieval line through a Stainless Steel ring (not a block) which is itself attached to a bungee coming from the back corner. Ring is both cheaper and works better.
if more info required then do a search on this forum. I've posted a full explanation about 1 to 2 years ago.
I still don't understand why builder are persevering with very outdated systems that were quickly disgarded as not working.
Wouter