GPO rotary telephone finger dials become sluggish over time, this is usually because of an accumulation of dust and perhaps over-lubrication in the past. After cleaning away any residual dust, debris and old clogged lubricant, a drop of Britphone dial lubricant oil on the insides of the governor cup and on the governor worm drive should bring the dial mechanism back to its former glory.  Lubricating the governor cup will deal with noisy and slow dial returns, additionally a drop of oil on the central spindle will also aid slowness.  For best reults, ensure too that any residual debris is cleaned away from the dial centre spindle prior to application. Britphone GPO Rotary Dial Lubricating Oil is a medium viscosity, high purity mineral oil, manufactured in the UK by Concept Oils.  It is designed originally as watch lubricating oil, but is ideally suited for use with GPO rotary finger dials, each 10ml bottle will service several telephone dials provided it is deployed sparingly. TECHNICAL INFORMATION: Appearance: Colourless liquid Odour: None Acidity/Alkalinity: Neutral Initial boiling point: >320C Pour Point: -9C Flash Point >170C Vapour pressure @20C: <0.1 k Pa Relative density @ 15C: 0.853 Solubility in water: No Viscosity @ 40C: 38.8cSt COMBINED POSTAGE: We will always combine postage wherever possible, simply add your purchases to the Ebay basket and choose 'request invoice from seller' instead of paying; this allows us to manually adjust the postage and you will receive an invoice from Ebay with the total amount.