Is it inert? The bomb could be full of impact sensitive, degraded HE, or maybe someone took apart the fuze and now it operates with a simple impact on the nose - no spin required. The risk adverse would tell you to take no chances and hand it over to the bomb squad. What I do know is that it is highly improbable that it was picked up off a battlefield in that configuration. Others would take a calculated risk and use their tools and bench vice to separate the two - the fuze can be sacrificed. However, we are not encouraged to share such techniques in this forum when the inert status of an item is in doubt.