This is a grenade inspired by the Grenade container (the threading is similar but I don't think they are interchangeable) and the modern Swedish hand grenades SHGR90 and SHGR2000 hence I call it SHGR95. Apart from the design of the grenade body the big difference is that my handle can fly off completely.

https://www.youtube.com/watch?v=KQEuGaKdda4

The sprint and pin are made from 1.5mm stainless steel wire.
I used a spring from a BIC M10 ball-point pen.
To reduce the wear on the handle i glued a small piece of thin metal inside (shielding can from one of my electronics bins).

Some images of SHGR90 and SHGR2000:
http://www.soldf.com/shgr90.html (Swedish)
http://www.lexpev.nl/grenades/europe/sweden/spraenghandgranat90.html
http://www.lexpev.nl/grenades/europe/sweden/oevningshandgranat90.html
http://www.lexpev.nl/grenades/europe/sweden/oevningshandgranat90h.html
http://www.lexpev.nl/grenades/europe/sweden/spraenghandgranat2000.html