[TowerTalk] Lubricant for Struthers SWR Bridge

[Jim Brown]

I bought a Struthers bridge at Dayton. It's the type where there are 
slugs for each frequency range, and each slug is switchable between 
power levels. One slug works fine, but the switches in the other two 
are in serious need of lubrication. I worked one loose enough that I 
can turn it with the knob, but the other is so tight that I can only 
turn it with a vise grip. 

The question is, what lubricant should I be using?  I've got them 
apart so I can easily lube them once I figure out what to use. 

Jim K9YC