Point the winder downwards and push the ring behind it towards the panel,you should see a wire clip it is horseshoe in shape,use a piece of hooked wire to pull the clip upwards and the handle will come off.To refit push the clip on to the handle all the way,put handle on the winder pin in the position you want it and bash the winder on with your hand,the clip will spread open and engage in the slot.It will be clearer when you do it.
Rich
April 2011