yaar about getting the pane weak, i really dont know, sometimes heating weakens it, and definately other times it strenthen the metal, as in case of swords and scissors and stuff u know, any ways i would hardly take denter 15 minutes for the job, if you can manage removing the sump yourself i would recommed youshould do it at home and take sump to any denter, that what i should've done if ..........