I use Lok-Tite brand of thread lock. You can get it at most dealers of industrial fasteners (screws, bolts, etc). The BLUE color #262, is what I use on my helis. It holds under the most adverse vibrations, but is easily removed when you want. The GREEN color is mostly for cylindrical parts like securing bearings to shafts, which you won't need for your heli. The RED is for a permanent installation. The only way to remove the part is with heat! Don't use it unless you plan to NEVER remover the part!

Rod