Pellet probe loose

how old is your Impact, i thought the new do not have this problem anymore. 

The lock-tite should fix your problem. When said tiny, I use a tooth pick to get tiny. The bottle can make a mess real fast with to much LT. Putting a drop off on the side, dipping the tooth pick into the drop. This gives you much more control on how much. I'd recommend blue holding strength. The green and red can be very hard to get off down the road. If you should choose to change your caliber probe. If you find your self having a hard time unscrewing the probe down the road. Use a cigar torch to warm the probe to about 140f. This will open the the lock-tite allowing you to unscrew while hot. If there is any thing your worried about getting to warm use a water damp rag to keep that area cool. This method is very similar to the way you'd unlock the hammer spring adjustment nut on a Fx Royal. Good luck