Yes, still using the Duo-Shis with ES-600 bodies and they ended up on my daily commute bike, so they got through some harsh conditions this winter. They hold up very well. I actually opened one a few months after installation and the grease inside was like new.
The O rings are not mandatory, you can install the bodies without, but it just leaves a 2mm+ gap. The O rings don’t rub on anything, they spin with the Duo-Shis inner spindle.
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