Shown on the photo below is a version without the threaded hole in the disc.
No pressure prongs possible on this one. This type is called M1.

The photo below © B. Bosman.
It shows the M1A1 fuze.

The two photos below show the same M1A1 fuze with an extension rod.
Both photos © B. Bosman.

Photos below © M. Jochoms.