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.
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: