So, my highway one JB needs a new truss rod nut as it's stripped and very difficult to make it turn. Anyone knows what is the correct replacement? 3/16" #0038454049 or 5/16" #003-8443-000 ? This is the model fender gives me with the serial number The service manual says it's the 5/16" but when I put a 5 mm allen key, wich is about 3/16", it seems like a good fit. Perhaps I'm getting confused, is 3/16" and 5/16" the measures of the diameter of the cilinder or the diameter of the allen key? the hole is about 8.10 mm which is almost 5/16" Thanks in advance for the help!