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Slot looks uneven and too slim.
I'd put money on the post being too small.
I'm not a fan of binder slots that aren't drilled at the end*. It looks like the slot goes right to the end of the lug so there might not be room to drill it but if you are taking it to a framebuilder anyway might be worth asking their opinion.
*I've made stems and slotted but not drilled them and you have to horse the binder up to get the stem to clamp. Add a drilling at the end of the slot and the stem clamps onto the steerer much more securely with less torque on the binder.
I picked up a very nice 80s Ciocc recently. However, I am not sure the seat post is the correct size. The bolt seems to be pulling it in too tight. Maybe I'm imagining it, see pics, one with 26.8 post fitted, the other with the post removed. In both the centre area where the bolt fits seems pulled very tight, even though I used just 5nm to tighten it. Could it be 27.0?
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