Hi Martin,

Its no help but I’ve had the same problem – I have a few “loose”. The screws are chromed and always in good condition, but they must screw into something which either rusts or is a captive nut which comes loose or disintegrates over time. Recommend that if the others are OK, unscrew them and lubricate to prevent further deterioration! I’ve not checked to see if you can access these from inside – probably not an easy job.

Regards,

Norman.