RE: Dle-20 Blew up....
The pic's are not ideal, but looking at the broken edge of the crank pin, you see how smooth it is? This is indicative of what is called "brittle fracture" The pin is hard, but brittle, probable cause is improper heat treatment or lack there off. Hope it's just an isolated case, and probably is. China's steel making practices are some what questionable IMHO.
I do own one 20, and so far would buy anouther without question.