u/Dinospice1

I recently bought a 2nd hand Mexican fender telecaster. It's supposed to use a 3/16 Allen wrench to turn the truss rod, but it didn't fit. I have a kit of Allen wrenches, and the biggest one that could fit was a 9/64. Upon closer inspection, I realized that the nut is completely round, and that the inside has screw nut grooves. I suspect the nut might be put in reverse. How can I take it out?