I received a PM from someone asking for clarification on why a fiber pad would aid in keeping the tip on, when you are introducing yet another glue joint to a simple system.
After answering the PM, I decided to post it here incase it might help someone else understand also:
The issue has to do with how materials compress and contract during contact with the cueball.
No matter what type of tip you play with... soft, med, hard, phenolic etc.
When the cueball makes contact with the tip, the tip deforms, and material from the moves outward from the center of the tips (imagine a water balloon sitting on a table, and you press on top of the water balloon, as the balloon flattens from the downward pressure, the sides also get bigger to allow for the change in pressure.)
This same concept happens with a cuetip on a shaft when a ball is struck. When you use a hard tip, and a harder ferrule material.. there is much less movement involved in this process as the materials themselves are much more rigid.
In this particular case, according to the laws of physics, the vibrations and deformation of material will follow the path of least resistance and try to find the most pliable material in your setup to apply those forces too.
In most cases, this weak link is the glue joint of your tip install.
To avoid these additional stresses, I add a fiber pad between my HH tip, and my LBM ferrule (VERY HARD), this allows a more pliable material to allow movement and less stress on the glue joint itself.
