Don't suppose you have a link to where you brought the clamp?
It came as stock on a Fuji track classic. They both take 27.2 posts, but the tubing is thicker on the Fuji so the lip on the clamp gripped onto the post when on the Moser. It worked very well and meant i could do away with the bloody quill post.
@LeChef started
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Don't suppose you have a link to where you brought the clamp?