Thanks Al.
I'll see what I can find, the C8 is mounted on a pier in my RO observatory with 6' high walls, and the house wall is about 2m away from the door opening, so not much chance of finding a neighbour's truck there
I normally use a nearby treetop dead branch tip as a convenient reference when aligning things, but it obviously tends to wave a bit in the breeze, so we'll just have to see what we can find.
Again, thanks for the help. I'm sure we'll survive
