rjng

Hi I would like to ask you experts a question on how to remove the golden keyhole structure as shown in the pictures below please? Basically the reason why im removing it is because the key can no longer fit in and we need to change the keyhole structure/key slot holder (unsure of what the exact name is) I have removed all the screws already but the golden keyhole structure can't be removed sadly. The protrusion below is forming an obstruction. Need urgent help please. Much appreciated. Thanks