Best J-Plug size and colors
I've tried J-Plugs with and without rattles but prefer them without. Fishing at night I'll use a J that rattles.
I tried drilling holes to add BBs to J-Plugs too. I had a devil of a time getting the epoxy to seal the hole. If you do drill the plugs make the hole near the tail.
This time of year I love extended glow Js on 2-5 colors in no or low light. I bought a bunch of Js on EBay and sanded off the finish, primed with white and then various extended glow and finished with clear coat. Grey Ghost, Chartreuse, Blue back/chart belly in size 4 my fav.