Mesa Urbino Stock Loosening in Benelli Posted December 19, 2020 · Edited December 19, 2020 by Agent86 Okay, a quick update. The internal star washer from Lowes didn't work. Stock loosened again after a single range trip. Put the Nord washer on and it is solid. No loosening after a good range trip. I will look to Nord washers in the future if I need to secure a bolt against vibration. And by the way, I didn't use the stainless steel version of the Nord-lock washer - I just used the cheaper option.