avsjerry finally nailed it. You have to use spacers inside the voice coil to center it in the gap which means you have to remove the dust cap in the center of the cone. You can not depend on the spider to keep the cone centered as it will rack rubbing in the gap at the back of the coil. What you use will depend on the size of the gap. You want them long enough to protrude far beyond the cone so you can pull them out easily when the glue is absolutely dry. I am not sure what the best glue to use is but Gorilla glue and Crazy glue are bad choices, too brittle. I would use the rubber cement that comes with bicycle tire patch kits. It remains pliable
which is what you want. I would contact Dayton (Parts Express) and ask what they use. They can probably supply you with everything.
which is what you want. I would contact Dayton (Parts Express) and ask what they use. They can probably supply you with everything.