Other than racking the slide repeatedly, do you think using graphite lube would make any difference over a period of time. Being very careful not to over do it, using a dremel tool, would do the trick quicker. Being an ex Dental Lab Tech. regular old black board chalk is a good but mild abrasive at a moderately slow speed. This of course would be used on the rails of the slide and receiver slide contact areas. I'm not at the point of doing anything to my Phoenix PA22, just asking members that have one for an opinion.