knurled nuts or wing nuts

[madmac]

hi folks, i am one of my old .22s in to a backpacker take down model. all is going well except the take down bolt. i could leave it as a screw and carry a screwdriver with me, but i came this far i would like to put some kind of tool free thumb happy nut on it.
any ideas on what to use or where to find such a beast

 

[maynard]

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