How about this idea: I have to set up a glorystar dish tomorrow, and I think if i had a plumb bob and a tape measure I could just find out how far back to lay the dish from the string (at the top) when the plumb bob is just touching the bottom edge of the dish. This should be pretty accurate. It would save lots of time. I just need to know how far back to set the top (in inches) so does anyone have a dish already working, that thaey could measure?