Topband: Need some advice on roller inductor lubrication

[wa8wzg at wa8wzg.net]

To All,,
I have an amplifier that uses a roller inductor,that does NOT use a 
"roller" wheel..
It has a wiper setup on the "roller" part and a Slider type setup that 
moves the "wiper" along the roller,,
I need to Lube the wiper where it contacts the roller,,its dragging 
pretty hard.
I need to lube it somehow so that it can handle HIGH RF current ,and 
Heat,,
Any thoughts from anyone on a good solution..
Its a pair of 8877's so some substantial current is involved.
Any ideas,,
Thanks
Tom
N7GP
ex WA8WZG