Thanks!
For those who might be interested in the future, I have added a breakdown of parts and measurements on some of the pictures. While doing that, I have accidentally broken the 2nd link in my original post. Sorry for that.

The trade-off for this device, of course, is that you need to spin it around manually all the way along the wire. This means you need a bucket truck. It was surprisingly painless: move the lasher 2 feet, spin it 2 times, repeat. The worst part is repositioning the bucket truck so many times. ALso being stuck in the bucket for hours in the rain.

Some improvements are needed:
- find a better way to hold the two halves together; the pipe clamps are simple ans strong but a PITA to apply and remove at every transfer;
- add a tensioning mechanism, probably just some kind of washer under the spool lid.