I have a moen stem removel tool I can't think on it's technical name right now. But I used it once on a deck mount to remove the retainig ring. Went back to the same house do to sand still in the lines at the Masterbath Tub. I can't get that tool to grab the slots like it did last time. I feel it seat in to the groves, Feels like I'm spinning the ring loose, But it's not spinning any thoughts or ideas how to get this piece of crap apart?