Hi John,The photos in posts #1 and #7 imply that the device is screwed into the central hole on the Mills base plug but the photos in post #17 show no such attachment device. Anders, was there a some attachment screw?
Yes it has a threaded center post like the one in photo #7. It is also visible in photo #4, which by the way is my photo! I have uploaded the same but with the bomb shown from the other side.

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