On changing the TCL cleaning rings there are 2 things I always try to remember.
One is if just changing the rings, just do this once (every other time) as the plastic rims lift the cleaner pads off the plastic frogs at switches (tyurnouts) and crossover tracks.
Other hint is to use an Exacto knife and trim the new rings with the TCL upside down on the test bench. I do this even after running the TCL several times to make the pads flat on the rails.