The rattle is due to the type of plugs on the pole ends as I described in this previous thread:
Having no luck finding the plugs, I decided to remove the desired plugs from an older set of "Outdoor Products" poles I have…the alum poles people have been buying at Walmart for ~$26. The pole diameters are the same, or close enough, that the swap went easy. I had to sand on the smaller plug a bit to get it into the LG CP3 pole.
In the following photo, the original LG pole is on the left. The pole on the right has the new plug….with a foam earplug inside to expand the plastic plug even further. 
The rattle is completely eliminated in the CP3s. Oddly, the "Outdoor Products" poles don't seem to rattle any more without the plugs.

