First I offer my thanks to the person who thought this up and shared it. I searched a bit (maybe not enough) and did not find the original post I stole this from. The jig allows your holddowns to reach in closer than your standard t-tracks might allow.
I was proud of my first version. My dad made one as well. Dad then recently reported that the apple-ply he had used had de-laminated under stress. Well, that put the whammy on me and my BB ply version de-laminated that very evening. Curse you dad, worker of evil voo-doo!
This led me to contemplate the ultimately wise words of our Ambassador and leading "just do it" philosopher, Larry Merlau who states in his sig line: If in Doubt, Build it Stout!
I took the failure of my jig as a personal affront. A scrap of beech, a piece of t-track, some epoxy and a trip to the jig-parts box . . .
The slots allow for angled positions.
The knobs set low to stay out of the way.
Good for grabbing small and odd shaped stuff close to the business end.