Changes to WasabiLord's model:

1. Weight. Changed the source of weight from bolts to shot or ball bearings. As long as it's filled with steel spheres of a consistent diameter, the weight should be pretty much right. In order to allow filling, the opening was changed to a threaded cap at the base. Use a coin to tighten.
2. Haptics. Added confidence clip and safety clip simulators. These aren't perfect and are a bit flimsy, but provide decent approximations of the manipulations needed to prepare the M67.
3. Strength. Reinforced the fuze/neck area and the spoon. Glue everything.

Pictured is an older version that got chucked a couple of times and still is somewhat together. If you want to use these things to practice throwing, I recommend using cotter pins attached to your keyrings instead of the usual split pins.

Print as thick as you want, but if you have trainees throw these things, they will get destroyed. Tall grass helps.