Just need something that will rotate freely.
We try everything before, WD40, white lithium grease... nothing really fix the issue once the weight of the car is on the springs.
The only thing that fix it is a PROPER roller bearing.
So have Koyo bearing press into all the springs cap of MeisterR coilovers as standard on all McPherson Strut model.
A simple and easy fix to avoid noise.
Because having a "popping" noise everything you are trying to park your car is just not cool.
Jerrick