• 26.0 seatpost with a bit of filler, let set and then tighten the binder bolt?
    Would probably mean you would never get the post out again though.

    Force a 26.2 seatpost in? Risk ruining the seattube.

    26.1 seatpost if it exists, file the gap in the binder clamp a bit and tighten hard. Again you risk eventually ruining the seattube.

    2 seperate partial shims in the ovalized bit? Same as suggestion 1. but you will be able to remove the post later. And it could be a pain to set up.

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