I saw that thread and I gotta say I've never had trouble using a regular socket for spark plugs. Although there are some instances where the rubber does help hold the plug in. As long as you support the head of the ratchet when you tighten them, you'll never break one. It's when you pull it tight and don't support it that the trouble comes in, because you tend to pull at an angle. When you do that, you'll crack the insulator almost every time. I've used the fuel hose trick a lot though.