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Thanks for the reply.
I think they did make the eclypse in 25.4.. Bit confused now as I did manage to get the stem on the bars (piega) eventually with some elbow grease and tightened clamp down, but clamp didn't tighten as far as another eclypse/piega combo I've got on my track bike. ?! Or am I being overly cautious here.
Italian stem in 25.4mm? Unlikely.
More likely that someone used it with 25.4mm bars, so it's closed-up.
Are both parts of the handlebar clamp binder threaded? If so, wind the screw out and slip a coin between the two parts of the binder, then wind the screw back in: it will push against the coin opening the clamp.
Otherwise you'll have to improvise a lever, such as a big screwdriver.