See, I never even did the 9/16ths. It was a mislabeled 1/2" straight to 5/8ths. I hadn't realized it at the time, so when the new plugs didn't fit, I just wore some spirals in simultaneously with my plugs until I could finally pop the 5/8ths plugs in. Hurt like a bitch when I was first trying, man. Seriously =/
I know, I know...