Andy, if it's in fact a Perfect 10, the top bar of the polar mount is very skinny compared to other 10 foot sat dish polar mounts.
P <<< here's the manual.
Please Post Pic's of 10 ft. and 12 ft. C - Band Dishes << pics showing the polar mount, which is a dead giveaway that it's a Perfect 10 when you see it. See how skinny the mount bars are?
Accuracy of string test << More info, don't tear down the dish itself if you can help it. If you MUST, split it in equal halves. You NEED the manual to put it back together, which must be done ON the mount, while on the pole, the instructions explain it. Only dish I ever had that had to be put together that way, or you couldn't get it right.