I'd like to hang a new chandelier. It didn't come with a bracket. The existing light in screwed into the ceiling plasterboard but the new light is too heavy for it. I am guessing that I need a round junction box that will allow me to fasten it to the joist as well as connect the wires coming in from the loft and hang the chandelier. What do I need to complete the job. I will be grateful if you could post links as well. Ta very much