[JadedKommando]

The part that broke was the threaded cap at the bottom of the grenade to cover the propane filler port. I'm not sure how they broke (it happened twice on the same day), I think they hit the bottom of the grenade on the concrete floor. When I tossed the grenade it functioned as per normal, when I was able to retrieve the grenade the bottom cover was off the grenade and it had snapped at the threads. I had replacement parts from my maintenance kit so it was a quick fix.