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Yeah, I'm also thinking of rattlecaning them.
I found one huge issue though. The cups that go into the seatpost are asymmetric and I don't think that it's supposed to be as one cup sits perfectly fit while the other doesn't go all the way in and is really wobbly.
Not sure if it is visible in the photo but the cones have different pitches.
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You should be able to get a replacement assembly from a Trek dealer or I guess someone who does Envy stuff?
or possibly a more modern version (and it comes in black also!) No idea if this one would work though, caveat emptor
https://en.ciclimattio.com/s/bontrager/seatpost-head-parts-2017/?id=18742&m=28873
hate that silver clamp. ano black would be way better, looks good otherwise