when i rig prawn tails, i buy the black tiger prawns with the shell on. They average in size from 2 inches long to 3 inches long. For springs i would use the cure above, steelhead is a totally different thing, I generally fish the tails cooked but not cured. I always keep them in a handful of coarse salt. The trick is getting them to stay on the hook. I use the spawnee net mesh squares, the jumbo sized ones in hot pink or peach and wrap the tail in the stretched out position, tying it off just above the tail fans with spider thread. I use a 1/0 barbless gami and once through the head and out, then stick it through just above were the spider thread is wrapped. Stays on better than any way I've seen them rigged. For natural colour or for wrapping procured died shrimp or prawns, use the peach or white jumbo squares, lets the color of the bait come through when it gets wet.