Whilst it's easy to cite a manufacturing defect, there is no supplemental information given in the statement to support this nor any metallurgical analysis. Simply stating it should not have broken and therefore the fault lies with the manufacturer is frankly ridiculous, since there are a myriad of reasons a part may fail, not least if it was incorrectly fitted, incorrect torque settings used, had previously been subject to stresses/impacts which may have weakened it's structural integrity. The material used for handlebar tubes is not "unobtanium" and a lot of manufacturers will uses similar based alloys to one another, so were this a genuine metallurgical failure of the material itself, could just as easily be down to a defective batch from the supplier, which may or may not show up during any machining process. If 'german4rings78' wants any kind of credibility, then I suggest you ask your colleague (who I am thankful to hear is in good care) to submit the broken part to Lightech directly or better still to an independant metallurgical test facility, who will not only be able to tell you how the part failed but also the likely force needed to cause the failure, which will reveal a lot more about the incident than mere observation ever will. More to the point it will be factually correct.
