Unity Robot - left forearm glitchy transform

Hello everyone, I am experimenting with animated characters and ragdolls. I took the Unity Robot model from the Mechanim tutorial, which is the same as the robotguard from the Stealth Tutorial Project. I got my animations on those working quite well, but I am facing a brick wall on applying a ragdoll on it (of course, I switch off the Animator component). So, the assignment of ragdoll bones/joints is a fairly straightforward process, but relies on pre-defined transforms in the model. The Unity Robot model has, I think, a glitch in the transform of the left forearm so that the transform is not pointing correctly: https://imgur.com/a/aGvcm . When I assign the bones/joints, the resulting ragdoll looks like this https://i.imgur.com/gMH54or.jpg . I have no way to rotate that capsule collider on the left forearm to align it with the model's forearm and, of course, if I rotate the transform itself, the model's arm rotates unnaturally. Is there a way to fix that? Thanks in advance!