Thats just a standard jam nut. Around here Id go down to the local Ace / Handyman and pick one up. Its nothing special. A standard nut and washer will work with some thread locker or better yet my preference some silicone instead if you can't find a jam nut or nylon lock nut.
I prefer silicone instead of loctite as it is easy to get loose later and it deals with vibration better in my experiences.
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