As previously posted, I’m tackling the dreaded rotted foam problem that befalls all old woofers with suspensions made of that material. I was hoping to avoid removing the dust cap, but I determined that, in this case, the only way to keep the cone centered in the magnetic gap while gluing on the new foam surround would be to secure it in place by inserting plastic shims.
With the easiest part of the rotted foam removal done, and the dust cap removed, the replacement parts are sitting loosely in place. I knew the diameter of the new cap would be 0.125″ too small, but it was the best fit I could find. Unfortunately, that means I’ll have to glue the cap onto the points where the dual voice coil wires leave the cone. It’s too late to turn back now!