Lamp vases

You blip every day for ages then inexplicably forget - so catching up with the best photo I took yesterday…
My grandmother converted her wedgewood vases to lamps. I used them for a while after having inherited them but now one of the light fittings has broken. I’m wondering if I could restore them back to vases but fear trying to remove the plaster which held the lamp fitting might just leave me with a pile of pieces!