I'm trying to flush the top of the toilet fill valve. I've installed and it works great, levels correct, but after it stops flushing, the part under the cap leaks for a few minutes. I tried removing it like normal where you push down and turn counterclockwise, but it won't move. I took the cap off and pushed down and pulled up, won't move. I'm afraid of breaking it, so does anyone know "the easy way" to remove it? I couldn't find any info on this part.