Please clarify this spacer and the loose problem.
Is it that the adapter is a loose fit in the bomb threads, which look as though they have seen better days and perhaps normal luting or cement could be applied, because once in, there is no requirement to remove it ever?
Is is because the fuze waggles, which it would because the paper tube which would be set in the filling, is not present. Some types of bomb with nose adapter, have the tube held in place with felt washers. Some have a double tube.