My lounge has a plaster ceiling rose, but the centre was previously cut out to fit a pendant light (pic 1). This screws onto a plastic disk screwed to the flat ceiling. Now I would like to install a small chandelier (pic 2), but this has a bar fitting (pic 3). We can screw this bar to the flat area in the hole at the centre of the rose, but unfortunately we can't then fit the chandelier because it needs to be screwed in horizontally from each side (red arrows). Do all chandeliers have a bar fitting like this or do some have screw fitting like pendant lights?
Another potential solution would be to fill in the hole in the ceiling rose, then fit the chandelier to the new plaster, but is it likely to be strong enough?