And notice how simple the jig is -- as long as you have a flat building bench and some dead-straight rods, all that you need is a set of blocks that match one another perfectly. I hadn't seen Sparky's T-section aluminum before, but I may adopt it for my next build.
It looks like Sparky uses aluminum rods -- I use carbon fiber rods ordered online from a kite shop, because I could get them long enough to build the whole wing in one piece. I got the ones that fit the jig holes in Brodak ribs, and then I got a matching Forstner bit from Amazon for scratch-builds. I'll probably keep using the CF rods, because they'll either be straight or broken, while aluminum may get bent without me noticing.
I also support the rods more thoroughly than Sparky does -- anything you use will sag in the middle; assuming a nice flat bench, more support blocks means a straighter wing.