I paid others to rebuild my 15" woofers, then, years later I bought the kit of cone and voice coil, did the job myself, it was a nice accomplidshment. Now there are videos to show how to do it, and you realize, it ain't rocket science.
Later, my Velodyne sub 12", foam surround rotted. Cone was fine. I replaced just the surround, even less money, easier.
The hard part is getting all the old glue off the outer ring, Simply persistence and the Boy Scout method of always pointing any sharp blade away from your other body parts.
