Finally took this die apart. Sprayed it with some Remington oil. Took 40 caliber bore swap and cleaned the inside. Cleaned stem the same way. Wasn't too dirty but everyone says every fifty rounds. Ran bore patch thru until clean. Cleaned pin and expander same way. Sprayed some Hornady one shot on both and let dry about five minutes. Wiped everything down and reassembled. Lubed about 20 with one shot and de primed and flsized. Can't tell any difference. Would have used brake cleaner if dirtier but all in all looked no worse for the wear. All cartridges still fit good in headspace guage. Did I mess up?