Modeled in Fusion 360, I made this for a Deathstroke cosplay commission. Should you choose to take this build on, please act responsibly when cosplaying with this prop. I heavily modeled it after an actual M67 grenade.

Printing: for the components with threads (pin block and upper hemisphere), I would recommend printing at a relatively low layer height to ensure the threads engage properly. Otherwise, scaling your x and y up by 3% or so in your slicer when printing the pin block will resolve any further threading issues. No supports needed for any of the files.

Assembly: The top of the pin block should rest inside of the clip with some glue. The two hemispheres can be glued together with some type of glue. The upper hemisphere threads into the pin block.