Mount for GO DISCOVER 6"

[Jimmy956]

Hello,
My brother has a GO DISCOVER 6" unit and has been trying to find a mount for it, as the one that came with the unit cannot hold the unit at the required position (it slowly tilts downwards; it seems the little sphere/ball is loose). He bought a new one (9UUB.001.40 I think) and unfortunatelly the same happened again after some time.
He would like to buy a new one with a ball tightening mechanism this time, like the 9UYB.001.04 but this is only available for 7" GO DISCOVER.
Could anyone advise a solution the tilting problem or a new mount with a tightening screw?
Thank you!

 

[raesewell]

Line the ball with foil.

 

[Jimmy956]

Thanks for the tip!
He has already used pieces of single use medical gloves round the ball, which temporarily fixed the problem, but has not used foil. I'll let him know.