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@M_V
You pre-set the position of the wedge from the bottom and then the bolt at the top/side of the post cams the long rod up to pull the wedge up and apply the expansion force?
What an overly complicated way to do it!
Could you get a clamp 3d printed that would fit over the post and create a shoulder that sits against the frame? Not sure if 3d printed plastic would be strong enough and metal might be impractical due to cost.
Actually, what about rather than epoxying the post in place 'for-life', build up a shoulder on the post out of epoxy? Then it's just a new post away from being back to stock if you need to sell.