Hehehe, from no answer to info overload!
O.K thanks alot for all the super-informative answers, as well as the excellent links. The fact is I really did not thought about the search function at all(stupid me). However, the speaker I want to treat is not a JBL, its a Tannoy HPD monitor and the fact is I do have the original reconing kits containing the complete assembly of cone, voice coil, spider and foam all in one piece(assembled). Meaning I just have to bolt down the spider centered and then glue down the foam and secure it with the ribs oround the chassis lips. I searched for the proposed glues and had no luck as the numbering system is different over here, but I think I am going to use some water soluble wood glue just to be on the safe side, as tannoy says no glue is needed!?