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Stem/steerer clamp bolts

Fitting a Ritchey 4-Axis adjustable stem, bought from SJS Cycles so it should be genuine. When I come to torquing up the bolts which clamp stem to the steerer, I find that the gap closes completely at about the minimum torque (5Nm). I can't slip a cigarette paper in there. This strikes me as wrong.

I've rechecked the packaging, definitely it's for a 1 1/8 inch stem, and the stem measures up at the same.

I've also checked that the bolts for the stem angle adjustment are correctly tightened to the specified 10Nm.
Any ideas? The stem seems tight enough, I can't twist the steering with the wheel between my legs, etc.

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