Flushing may or may not work and is a Band aid IMO. It did not work for me, I ended totally disassembling , cleaning and re-lubing. Their are two different venders on Ebay who will do this for you, or you can buy a 10 speed campy Veloce for 115.00 with cables and be good for a long while as they use the same 2.8 cable pull. Their aere places inside those shifterts you are not going to flush out , even with a can of brake clean and compressed air.