The shoulder triangles seemed like mostly a tolerancing and assembly issue (I even had issues on one of my Luca RVF-171s with the shoulders not being assembled correctly). They might explode just from existing. The leg issue though is a seriously complex thing. It's a combination of effects from bad structural design, bad transformation instructions, and bad materials. On the structural design part, the entire thigh swivel is based on a metal spring pin inserted into a hollow plastic shaft