I was able to get mine in by spreading them a bit, you'll be surprised by how springy it is.
I didn't really want to force it, 26.4mm is suddenly quite a lot when it's rammed up your arse because your chinese saddle with a huge cutout cracked! Have you ridden it for long like that?
@yoshy started
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I was able to get mine in by spreading them a bit, you'll be surprised by how springy it is.