Saw where several types of swim jigs come with willow blades attached to the jig's hook. Rather than buy some of these style swim jigs, I'd like to simply add - somehow - a willow blade to the jigs I have already purchased.

But need to see how this can be easily done!

Loop the split ring from the swivel over the jig hook. Use a small piece of surgical rubber to hold the swivel in place like you would a trailer hook on a spinnerbait.

http://www.tacklewarehouse.com/Gambler_Southern_Flash_Swim_Jig/descpage-GSOF.html

Many ways to do it
Large size Decoy keepers above and below swivel to split ring to blade

Another way to do it using tubing instead of keepers


Heat shrink on the swivel eye could work
Could also cut some small circular DIY keepers out of a plastic jug