im just haveing this problem... bride wants the same as yours, but nothing inside the vases !!!!! i just know they will steam up with the covered oasis plug we normaly do, so been tyring every concivable dish bowl pot the lot...
i too am going insane!!!!!
one bolw fits on vase and then try the next vases and the same bowl dunt fit aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaa

got the top bit fine

just the mechanics r doing my head in !!!!!!