Well done SW a great way of wheel truing with out removing the wheel. I use the same system myself once I've laced and trued a wheel the cable tie remains in place and is simply twisted around out of the way for future truing if needed.
Thanks for posting that SW. I've always seemed to make a hash of it in the past, but using that method, I've just "trued" 3 wheels which had irritating minor deflections and it works brilliantly!