Rabbit,
I'll try to get a better pic, this one doesn't show the incremental adjustment holes, but shows the curvature at the top:
2016-7-25 West array (5)resize.jpg
http://forum.tvfool.com/attachment.p...1&d=1469533592
Sorry to say, I can't get the pics to show here in this forum. I used the technique as in Hi Def, doesn't seem to work.