Curious object on ww2 grenade site

Hello all I would like to post some photos if I may of a strange flare threaded looking object found near an RAF airfield at a ww2 grenade training area that has mills bomb bits and mortars etc so as this object shown I have not ever encountered before I hope at least one of you may identify it, nice black arrow with "THIS WAY" written on it and its quite heavy, it has serials on the otherside too "SN04" is one at the bottom.

Many thanks


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