I tie a lot of hair jigs and I have used both wire weed guards and fiber weed guards and the wire weed guards work well in rock, other than that I like using the small 1/16" FG-9 fiber weed guard. You can add a wire weed guard to any weedless mold, for jigs that have a small weed guard slot you simply use plumbers putty to fill the slot and then add the wire or you can use aluminum foil to hold the wire and keep the lead from bleeding out of the cavity. For normal 1/8" diameter weed guards all you need is a skirt collar and put the wire in the center and drop it in the slot, the collar holds the wire and keeps the lead from bleeding out as well. So if you have a size with a certain hook, you can find someone to pour them with wire weed guards.