i have a nice pink hammer mounted on a disk use to open up to like 3.5 inches wide. i had a problem with my levels in the tank and this piece doesn't seem to be recovering. i think it will do a lot better in a stable tank. i really just need someone to test my magnesium for me and ill give the hammer away for free. if i could get a little frag for it that would be great but not necessary at all.