When installation requires thread lock, use the best!  Loctite is the most widely used and reliable thread locker found on work benches. 

Loctite 222 Low Strength Screw Lock Threadlocker 50ml Bottle
On Sale 33% OFF
Loctite 222 Low Strength Threadlocker 10ml Bottle
20% OFF
Loctite 248 Medium Strength Threadlocker 19g Stick
22% OFF