BTW, for any who are interested, Justin Hyatt tracked me down and sent me new C-4 shockmounts due to statements I made regarding mine, which really did suck. Although similar in design to the originals, the elastics are strung differently, and more importantly, the composition of the plastic on the new ones is vastly superior to the old ones, and they are quite usable. They do have the plastic threads that DJL complains about, and although I agree that brass inserts would be preferable, if you are careful not to cross thread them, they are just fine.
Before anybody jumps on PMI for taking so long to correct the problem, it is entirely my fault. As I have other shock mounts, I didn't really pursue the issue. If I had brought it to Justin's attention earlier, I expect he would have been quite prompt. Thanks Justin.-Richie