Thank you. But for this purpose, I am going to go with graphite, as graphite migration out onto the aperture blades could actually logically be beneficial. The way the assembly is made, the ends of the blades are jut stamped indentations that are trapped in their slots in the aperture plate. Now, the stampings have gotten sloppy and allow the blades to slip under their slots and out of place, jamming the stack and bow outward causing more damage. CRC won't work on this as I've tried a similar aerosol manufacture by my big customer locally. Lithium grease--no. Oil--not very good. I think this calls for graphite.