Hi Phil, I was thinking along the same lines, rotating glass would make it too heavy also, I did find the PGY set on eBay and sent them a couple of questions in regards to the CPL, they did not answer my question about the rotating glass, but did answer my question as to how I could purchase just the CPL perhaps that is why they did not answer it because they are aware that it is not a Circular PL, so they are in fact falsely advertising the product, I already have a PL filter and do not want to get another one.
Once again thank you for your feedback.