Apologies I had not been back here since my prev post.
Follow-up from others inputs.
Yes as discussed with Peter today, the EW datum line is the WTG, plus a NS line bisecting the EW.
We can cast in two V grooves (E-W N-S) in the concrete with 25x25 steel angle centered on string lines. The two grooves will then positively locate all varieties of tripods, with reasonable accuracy.
Most people should be able to use a tape measure to check their back leg positions laterally. For the fumble fingers we can include a steel center detent to hook your tape end.
If not already done, use permanent marker to scribe your back leg extensions equally at your preferrred height. Then setup should be quick and accurate.
Or we forget the above and find Robin's 4x4 hardwood and fit a few anti-trip red LEDs
Maybe not so good when we have the "Doctor" on the table Peter
Cheers to all, David
