The diameter of the hole is about the same as the diameter of the expander.
The 2mm might be a problem indeed, when I tighten up the screw at the max, the expander can ''expand'' around 1mm or so. The expander might be too loose inside even tighten up to the maximum.
So you dont want to drill through and use a nut but 2mm on coke shims is a better solution? Probably will need to file the look clamp to shape unles this frame also uses a 25mm post.
The diameter of the hole is about the same as the diameter of the expander.
The 2mm might be a problem indeed, when I tighten up the screw at the max, the expander can ''expand'' around 1mm or so. The expander might be too loose inside even tighten up to the maximum.