hmmm...maybe I need to try again. Was sort of tired last night and got over it quick and put it all away. Went to the computer to order some 10's and got distracted and did not. The never ending "no matter how many you buy you do not have the one you need" saga of replacing orings continues. I actually might have had them twisted. Thanks, I will try again11 x 1 mm is pretty much what I use in those locations. Care needs to be taken that the o-ring isn't twisted when rolled on. I get under them with a safety pin pin and pull outward and go around the grove to untwist it if it did get twisted. And I'll just mention that they need lubed with juice.
And then again maybe it's just too big, how do the 10's fit? 10.5 x 1 mm is available.