Use a rocket blower and remove all the small metal shavings and dust and use a paper towel and cotton swabs with naphtha to clean everything. This aperture ring will have some old grease on it. Most things that create a dust barrier to the lens I use a very small amount of Super Lube silicone grease. By small...I mean I work it in like you would work in hand lotion or shoe polish. You shouldnt be able to see gobs of grease anywhere, just a light coating.
Aero EktarLens RepairCamera RepairFilmLarge Format4x5Speed GraphicGraflexKodakAeroEktar178mm 2.5