A hint that will help perhaps. I use the 3rd hand tools from Harbor Freight or others to hold the parts together then I mix 50% epoxy with 50% Tungsten powder I get from Alumilite. It bonds as well as solder and is as heavy as pure lead. It is as dense as pure lead so it shows up well on the fish finder.
The only drawback is the curing time, but, for me, it is worth it because I can use any hook I like.