I went over the contacts with an alcohol swab, but no luck. I notice that when the lock is set at f/22, the aperture ring still has a slight give to it. I'm not sure if this is always the case or not, I just wonder if maybe the ring is not set properly or the lock is not working exactly as it should..
In any event, the issue is yours to solve! See my other Nikon ads. The item "Nikon 50mm f/1.8G plus a Parts/Repair FEE 50mm f/1.8D Prime/Fixed FX Lenses" is in sale since Friday, April 2, 2021. This item is in the category "Cameras & Photo\Lenses & Filters\Lenses". The seller is "and_one_more" and is located in Tusket, Nova Scotia.
This item can be shipped to Canada, United States.