Make Adjustable Router Guide Jig | Perfect Dados & Grooves - YouTube
WoodRiver - Growth Chart Router Jig
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! : Amazon.ca:
First attempt at a router flattening jig.. : r/woodworking