eames contract base stuck casters  

I don't have any Eames...
I don't have any Eames office chairs but I have had various type casters on the chairs in my sewing/upholstering room over the years. They do get amazingly clogged with threads.
Some casters can be pulled out pretty easily, but I've found that a pair of thin-bladed, sharp scissors and maybe a hemostat or a tiny hook made of wire is all that is needed. Cut the threads in several places and pull the loose bits out with the hemostat or hook. It is usually a bit slow at first but then you will be able to get most of them out in a big hank or two. It doesn't take me more than a few minutes per caster most of the time.
(And yes, I always vow to keep the floor swept better, but somehow that never works in the end.)

thanks for your...
thanks for your advice.
i suppose i could also add some WD40 afterward for good measure.