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You can totally strip the 11sp ultra shift right down. It's actually not hard at all. I've one it several times now. check my thread https://www.lfgss.com/conversations/384608/?offset=50
The Athena 11s shifters, I have stripped down the power shift ones, but have had trouble getting them to downshift (release cable) smoothly if I'm honest. The ultrashift version (2010 only) are identical to Chorus/Record 11sp
I managed to wrangle the toothed ratchet back round so it engages with the lever mechanism again but if I do too many clicks down it slips round again and won't engage. I can get a cable fed through but shifting is not winding the cable in so something is obviously in the wrong position or out of alignment. The left shifter was the one which had the piece of cable snapped off inside the body so maybe that had something to do with it?
The perils of buying stuff on eBay! I messaged the seller and he said he had them working before but would do a refund or a discount if they were genuinely not working/damaged.
Tempted to start taking it all apart but might not get it back together again.