Hi... Im assuming that this is sorted now as its been a while since a post on this thread but... If its really stuck... depending on the light fitting it might be easier to just replace the fixing! Could even be cheaper than buying the glue! http://www.screwfix.com/prods/94296/Electrical-Supplies/Switches-Sockets/White-Moulded/Volex-Range/Volex-6-Pendant-Fitting