>From your photo, it looks like you have a B-67 saddle (sprung, one clamping rail, one support rail). If I’m wrong and you have one of the double clamping rail saddles like the B-66, you’re using the wrong kind of seat post. If it’s in fact a B-67, the seat post is correct, but the bolt is wrong. It should be a hex/Allen head metric bolt with a washer, not something with a nut. I suspect that the original bolt was lost and an SAE/US bolt was forced/cross-threaded into the top of the clamp, with a nut added to tighten it. I would only do that in an emergency where the only bolt available was SAE and I was a long way from home, realizing that I’d ruined my seat post and would need to replace it as soon as possible. Either way, you should have a bicycle mechanic look at your bike and install a new post that matches your seat design.
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