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Top pour aluminum molds have always been a pain to pour into because of the hollow cavity in the front part of the bait especially if the mold is cold. Bear solved the problem by making an expanded well above each cavity and no bubble has ever formed in any of molds. I have stick and worm molds from other companies and most form bubbles when the mold is cold. even after a few pours. The bubble can take uip 1/3 to 1/2 of the lure, making that part hollow and making the lure unusable. I discovered this remedy this morning: Take a socket from a socket set that can sit over the hole and place it there before filling the cavity completely. The hot plastic gets sucked down into the socket just like in Bears and prevents any hollow spaces. I've tried this with four different cold stick molds and a two-part plaster creature mold I made a few years ago and no bubbles. If you don't want to buy injection molds for the same designs you already own molds for, this works. Plus, if you look at most injection mold openings, they also have a well above the smaller pour hole. So nice not having to deal with bubbles and repours!!!