VF-0 REPLACEMENT ARMS ANNOUNCEMENT
Regarding the VF-0A and VF-0S replacement arms which Yamato has recently made available as spare parts, it seems there has been some misunderstanding and miscommunication between Yamato and myself regarding the exact nature of the improvement to the arms.
Based on earlier discussions with Yamato, I was under the impression that the shoulder and elbow parts (the grey ABS plastic parts that have been widely reported on Macrossworld as getting stress marks and/or cracking), would be changed from ABS plastic to POM plastic. However, it turns out that this is not the case and any such statements to the effect are my mistake.
Yamato spent a long while studying this phenomonen and determined that the stress marks and cracking of the ABS shoulder and elbow parts was caused by the ABS plastic having an adverse chemical reaction with the PVC parts located inside the arm (this is actually what they suspected from the beginning). Apparently, it is a well known phenomenon that PVC can react negatively with and weaken ABS.
What Yamato have done on the replacement arms is two improvements, as follows: -
1) They have removed the PVC cup and O-ring from inside the arm and replaced them with SBS Rubber parts, so there will be no chemical weakening of the ABS.
2) Secondly, the ABS parts marked with a red & green circle in the attached picture were previously just regular ABS. After Yamato found the problem, they had the factory increase the hardness of the ABS material.
Whether, these two changes will be enough, only time will tell. Personally, I would have liked them to increase the thickness of the oplastic as well, but that is not possible without complete retooling of the affected parts.
Graham