Have you tried just prising open the clamp at the back slightly, had the same problem on a 27.2 post a 27.0 was too small and the 27.2 went in about an inch the got really tight. Just gave the clamp a little wiggle and it slid in fine.
Yes, checked for that issue. No distortion in that area at all. From what I have read, these frames are a bit hit and miss when it comes to establishing post size. Guess they just grabbed the nearest tube and used that.
Peugeot used to use something less than 25mm, I can't remember what size it was .... 24.something as you say. I had a nice Selcof post on a late 80's Peugeot mountain bike so quality ones did exist. What the chances of finding one now are.........
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I'm good with a fraction of that price. Mine is used, not NOS. Give me a day or so to look it out and send you a picture. I'm sure we can agree a price.