Do you need this? I think it will depend on your application, how you fish. If you are going to be throwing lighter lures, say under 2 oz, and not for distance, a shock is probably not necessary. But if you are going to try to get distance on your cast the shock will save you some lost lures. I usually cast tins and pencil poppers up to 3-1/2 oz, so I use a shock leader to minimize my snapoffs on liftoff.
On my spinning reels I use 15 lb PP running line with a 40 lb PP shock tied with a uni to uni with a drop of superglue (to cover sins). The shock has to be long enough to wrap 3-4 times around the spool up through the guides back down to the to the bottom guide, then a 80# Spro swivel with a Trilene knot, and on the other side 40 lb fluoro leader with a Crawford knot (I think I'm the only one who uses this knot - use what you like). The uni-uni knot flies right through the guides, never had a problem. Once you get comfortable with the setup, shorten/lengthen the length of the shock (in my case the 40 lb PP) to the swivel to suit your own taste, but you have to have at least the 3-4 wraps around the spool (more is excessive, less is ineffective).
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