Illumination Supply is providing you with a great after sale service, but maybe you are one of its best loyal customers ;-)
Just one note about a detail that popped up when i unscrewed the bezel:
there is a thin transparent flat seal interposed between glass and bezel, not easy to keep in place when it's time to reassemble the head assy.
I did not removed the glass (dust is always in wait to jump inside flashlight reflectors ...) but i had the impression that bezel / body gap is due to wrong o-ring thickness plus above mentioned seal presence.
If someone has interest in it, there is hope to lower the gap changing the original o-ring with a thinner one.
I agree that the gap is not a big problem, but sure with the time it will tend to retain the dirt.
Changing the subject, i found a japanese webpage with an interesting mod of the flashlight UI led :
http://katokichi.cocolog-nifty.com/hitorigoto/2012/12/ea4-8bde.html
Thanks to the brave guy that took apart its own EA4 making photos, now it's clear how the switch assy is made.