"All my spindles are the same size"
maybe they are all 2.5's manitunc? :^)
my ET 2.0 spindle appears to be about 5/8 inch. The 2.5 is about 3/4 inch.
Here is a picture of the inside that ketchup was nice enough to post earlier on.
http://i272.photobucket.com/albums/jj177/picswamp/20121124_150329s_zps44708d12.jpg
If you push yours out you can see the condition of it and determine if it needs cleaning. Bruce used to put the initials HP on 2.0 and 2.5 manifolds to indicate high pressure versions.