As an FYI for anybody getting ready to take apart their own lens to repair it, be aware that Japanese made lenses frequently use JIS screws [0], not Philips. If

As an FYI for anybody getting ready to take apart their own lens to repair it, be aware that Japanese made lenses frequently use JIS screws [0], not Philips. If they aren't super tight, you can get away with using Philips, but you wouldn't want to make a regular thing of it. I've had a no-name 28mm lens apart a couple of times to clear oil off of the aperture blades. The old manual everything lenses are relatively straightforward to get apart. Be aware of the minuscule ball bearing that engages the detents in the aperture ring. It's spring-loaded, which might be obvious to you, but wasn't to me the first time I took the lens apart. [0] https://en.wikipedia.org/wiki/List_of_screw_drives#JIS_B_1012 https://en.wikipedia.org/wiki/List_of_screw_drives#JIS_B_101...