You confirmed my suspicions. I worked with ribbon cables wider than these many years ago when I worked on mini computers. I bent some pins before I learned how to unplug them. I always try to support the mobo with my other hand when plugging or unplugging. I don't like to yank on the cable when unplugging, but I don't have a choice. I still wince when I do it.
Well, I've bought my last PATA drive. SATA forever! Until something better comes along, that is.
I should mention I don't have the 20x but I do have the SATA Liteon 16A7.