I did have to use a dremel to remove a bad nick where someone hit the pin with a hammer, it was large enough i could not get on the zert with the standard grease gun end but no problem getting my lock type on the zert after cleaning the nick off only problem in cleaning the nick off the recess I accidentally nicked the zert and can not get a 10mm socket on the zert even after grinding the socket flat on the end . There is not enough of the zert sticking up to get the socket to catch. I could knock the top of the zert off and remove with a ease out or reverse drill, i was just venting because the design makes it a pain in the *** to chang the zert.