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 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.

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.

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:  If you want to buy multiple items, this is hard to automate on Ebay so the way I deal with postage is to say that I will combine postage and that you just need to order whatever you want and pay whatever postage Ebay charges.  I will then refund the excess postage you've paid.  Typically I change a maximum of £3.65 which is Royal Mail's rate for a 2Kg 48-hour small parcel.