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Wow, I have home work or mail to post
So, per OP's description, it's power shift. One great at a time via the droopy button (though of course this is the front/left). Noting 'looks' broken. But the pile of parts sadly doesn't look like the picture above. The final bit that I stupidly removed was what I'd describe as a cheap metal disc, secured by a bolt, under which was the white cable-carrying wheel. I suspect that an attempt at reassembly is best a job for OP
In the meantime, the 8spd mirage shifter I've got mounted, paired with a 10 speed Chorus front derailleur, on a chorus 10 crank, works wonderfully with my otherwise 11 speed (chain/cassette, rear/left shifter/mech) system.
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