Run your fingers around the underside of the rim - you may then locate an obstruction/defect
Can't feel anything, its just smooth with three or four holes on either side of the water inlet hole.
If you're refering to a spreader there isn't one unfortunately. Has it been seen that some toilet's don't have it or is it key to every toilet's operation? As others have indicated, I think I'm going to have to contact the supplier on this.
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