I'm not sure exactly which one you are referring to?? Is it a 3 piece mold or a 3 cavity mold. If it has 3 cavities, we probably just layed 3 lures next to each other, built a box, around all of them, sealed it, mixed up our silicone rubber, poured it in the box over the 3 lures, and allowed it to cure. Once cured, we removed the box, removed the lures, and had 3 cavities left in the mold.
See the swimbait tutorial ... the 3rd from the bottom on the videos page of
www.makelure.com and it should walk you through making a multi cavity mold.
If I'm off basis, please respond by putting a link in your response to the video you are referring to.
Thanks,
Mike