Interesting thread, I have used rubber bands...
Hello, I just recently "invented" a rubber band method of "training" the cone to stay farther out like it should be. I had gotten an EV woofer that I think was stored for many years on it's "back" and slumped the cone in the suspention to the rear. I took a series of interlinked rubber bands and made a "ring collar" around the cone above the tinsel or lead in wires, and had two more rubber bands pulling up on the "ring collar" at 180 degrees apart. These two bands were attatched with tape just under the mounting flange on the "arms" of the cast basket. This pulled just enough to line up the cone to the "normal" position. And allowed a good sounding "burn in" test tone to run.. Thanks, hope this might help.. Rolf Erickson.