Originally Posted by
walpurgis
I've said before, the surround is bonded to the cone first. There's usually a visible 'ring' on the cone where the old one was, so just use that as your guide. Then fix the surround temporarily to the chassis lip using BlueTak in three equally spaced positions. That allows you to move the surround about until the cone moves freely back and forth, then leaving the BlueTak in place glue the cone also in three small places between the BlueTak blobs, allow to dry, remove BlueTak and glue the rest of the surround. Your cone should be perfectly positioned.