Sometimes, (apparently) the tube can permanantly deform at the top, leaving the opening fractionally narrower than it should be. Either get it reamed (expensive) or you could try the screwdriver trick (at your own risk...)
@Mc_Nebula started
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Sometimes, (apparently) the tube can permanantly deform at the top, leaving the opening fractionally narrower than it should be. Either get it reamed (expensive) or you could try the screwdriver trick (at your own risk...)