The pin in the default model is 4mm in diameter and the model "Flat" can be edited for whatewer purpose is needed.

The Thumb Nut hat 2 options - for thread tapping or for M3 Nut. For the M3 Nut the print must be paused on the 6.4mm mark and the M3 nut must be inserted.

The Fusion360 files are also here.