How in the world do you remove the plastic piece that holds the propeller mechanism on the top rack of frigerdaire dishwasher. I'm replacing the racks for top and bottom as the dividers burned up, and they just sent the wire part,(no propeller attached to this one-they said I could just transfer it over) so I got the propeller unscrewed but the holder is still attached to the wire tray that I need to transfer to the new one. Help!! thanks.:(