Thanks Neil; its a Disiciacci (sp?) m/c so Brembo might not be keen on giving advice. Just been on the Redracingparts site to see if they sell the m/c as a separate component but no luck, you have to send it off for repair/replacement.
"That'll teach me" for the thousandth time. Mind you if it's the thousandth time 'it' evidently hasn't taught me...