This is just a guess, but I'm wondering if those crosshatched knurled pieces could be the interior section of the Glühzünder 28 where the bakelite casings have deteriorated or been broken off???? I've only ever seen complete examples before.
I'm sorry to have to play the role of the bad cob, but I hope your fingers are well insured. Even 70 later, these little things may be still dangerous...
I haven't seen anybody making such 'advice' or 'caution' message, so I do ...
Hope you are aware about some risk you are taking...
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