I use Permatex Anti-seize lubricant #133A. Its made for sparkplugs but I use it for choke tubes, percussion nipples, and also the breach plug on my great granddads Springfield musket. Almost any auto parts store has it, its inexpensive and Ive never known it to fail on gun parts or on sparkplugs, even sparkplugs thatve been in the car for 60,000 miles unscrew readily. It's never failed on choke tubes.

Approach life like you do a yellow light - RUN IT! (Gail T.)