Sun Visors

[seacat]

When I want to use the sun visors and pull them down from the stowed position, the visor generally ends up on the floor of the car or my lap.
Where the visor frame goes into the roof lining there does not seem be anything holding it in place. (Not the best description, but the best I can do for now)

Has anybody got any ideas as to how I can secure the visors so that they don't detach themselves and end upon the floor everytime I want to use them.

Thanks

James