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advertised as a 26.0 clamp is in fact a 25.8 (-0.0/+0.2)mm
25.8+0.2=26.0 😀
The two sizes are interchangeable, because both have to allow for the wide tolerance range on handlebar diameter.
Not sure where you're planing to use the mallet, but the more conventional method of dealing with a close fit in a bar clamp without a detachable face is to use some form of pry bar to spring it open enough to avoid scraping the bars.
gbj_tester
So the stem I bought that was advertised as a 26.0 clamp is in fact a 25.8 (-0.0/+0.2)mm. It's already marked the new bars I bought, aargh, so is tapping the bars fully into place with a mallet a really bad idea, or should I try and find another 150mm stem with a true 26.0 clamp?