I like the way this idea is developing ... an extra-long guide, not only to line up the two holes, but to also locate them exactly where the panel needs them to be!
It's a bit of a change in our sequence .... the 'normal' way seems to be to place the panel first, and then decide where to place the holes .... and with this device, you would first place your mast supports, then drill, then set the box. Or, maybe, set the box, mark, remove box, drill, mount again.
Still, though, it looks like a great way to get it done better, quicker - and smarter!
