Stephan Price - Captured hollowing system - February 2018
Here is a picture of my system as well as the article that I built it from.
I made one cutter from 3/8 drill rod, and bought a Lyle Jamison cutter adjustable head.
(pure happenstance on the spider thickness gauge hanging off the laser (cat toy).
Stephen found the directions at The Woodturner's Resource on the Shop Made Tools page Here