As you see in the added pic this is a well known lure known as the Huddleston swim bait. My question is if you look closely under the rear treble hook there is a pocket of air. how does one go and add this into a soft plastic swimsuit is it injected with a needle or something inside of the mold??? I know they use this for when the bait sits on Botton the back end of the lure sits slightly upwards presenting a very very natural bait...