Here's a summery of what we know so far regarding the problems with the VF-0 arms. Please let me know if anything I've written is incorrect or something is missing.
1) Stress marks and cracks are appearing on the inner (front & rear) shoulder sections.
2) Stess marks and cracks are also appearing on the lower part of the bicep swivel joint.
3) The problem seems more prevalent on the VF-0A, but has also occured on the VF-0S.
4) Some toys have stress marks and cracks right out of the box.
5) One theory put forward by some Macrossworld members is that the seam line on the shoulder ball joint is contributing to probelm with the shoulders, as it may extert exess pressure on the shoulder parts when the shoulder is moved.
6) Another thory is that the top screw on the back of the shoulder joint is too tight and causes the plastic to crack.
7) As a preventive measure, the seam line on the shoulder ball joint should be filed down.
Also, the two silver color screws located on the rear of the inner shoulder, especially the top screw should be loosened slightly (about a half turn?) to decrease pressure.
9) Some members have theorised theat the rubber O-ring o the bicep swivel joint may be too thick, causing the joint to crack.
10) As a preventive measure, the bicep screw should be looseend slightly and/or the rubber O-ring removed.
11) Initial coments from Yamato are that these problems have not been reported in Japan yet and also the problem may be caused by an adverse chemical reaction between the rubbber and ABS, which weakens the ABS.
Anything else?
Graham