The seat tube should be the correct internal diameter for the intended seatpost when the slot is straight.
If it is pinching in, you are using a too small seatpost.
I believe some other Peugeots used a 25.4
I've tried with other 25.4 seatpost but it doesn't fit at all even with the slot opened up with screwdriver when the slot lines is parallel, maybe it's like 24. something or 25mm size? I've ordered the 24mm seatpost for Peugeots when I didn't check if the frame is pinching down, because the original one that came with the bike was also 24mm. All information that I readed online about Peugeot size from 80's low tier bikes is 24mm. I need to find some 25mm post and try with it maybe.
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