If it's gonna stay, hairspray is pretty good
Lots of people suggest that for the post itself, not so much the clamp, but I don't see why it wouldn't work.
What about a certain type of loctite compound?
I tried that but it was fiddly to get the saddle at the right angle before it got sticky. And it still slipped. I’ve never actually tried epoxy as I sold mine and found some much better designs out there that don’t slip.
@hippy started
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If it's gonna stay, hairspray is pretty good