Amazon.com: Slab Jig – Router Sled for Woodworking – Levels Wood Slabs Up to 64 Inches Wide! Portable, Durable, and Easy to Adjust! Great for River Tables and Home Improvement Projects! :
Building a Better Router Sled/Flattening Jig (Part 2) - YouTube
CGTK - Router Sled
How To Make A Router Sled To Flatten LARGE Slabs! - YouTube