Well, due to a number of factors (peace of mind being high on the list), I decided to purchase a bonifide constant current power supply. I found this one on Craig's List for $65, but probably spent another $25 in gas going to get it in Akron. It's in excellent condition and even came with the original manual.

Next, I bent up some aluminum wire clips to hang the parts from and conduct the current.

Everything is clipped up and ready to go in the first bath.

After several hours (most of that in the Anodizing tank), all eight of the pushrod tubes are done. I'm still undecided whether to try to anodize the aluminum fittings on the intake tubes, but I'm leaning towards giving it a go.