The carbon tube is a great idea.

I got some of this from mcmaster.com (or don's hobbies has it) to try on the bolts:

Vibra-Tite Reusable Threadlocker
After coating your fasteners to make them self-locking and self-sealing, you can adjust, remove, and even reuse them. Use on ferrous and nonferrous metals, platings, wood, and nylon screws of all sizes. Threadlocker resists water. Cleaning parts isn't necessary, simply wipe off visible oil. You can even coat your fasteners ahead of time and store them indefinitely. Dries to the touch in seconds; however, allow to dry 10-30 minutes before assembly. Temperature range is -65° to +165° F. Color is red.
Size Each

1-oz. Brush-Top Bottle 75145A69 $16.84

I think someone else recommended green loctite.