Can someone tell me if the opening for the fuze on an 18 pdr HE shell is smaller than the opening on a shrapnel shell? Today I received a No85 fuze from one of the forum members and it unfortunately does not fit my HE shell body (fuze is too large in diameter). It appears that the bottom set of threads should be removeable which I am thinking is only there as an adapter for different styles of shells. Is this the case?