Aputure 80c DC Barrel nut

I have a shoot tomorrow but someone managed to lose the nut that holds the DC barrel?? HOW DOES THAT EVEN HAPPEN? Save yourself the headache of trying to locate this silly sized nut and print the one I made.The thread size is 5/16-32; uncommon to purchase locally….I tried 4 places. IMPORTANT: PRINT AT 103% IF PLA THIS COMPENSATES FOR MATERIAL SHRINKING. I have not tested this in any other material than bambu PLA Basic.