Guitar Hack

Just got an Epiphone LP Traditional Pro IV. Was having trouble with the truss tool size. I have a high quality 4mm, but it has a bit of girth to after the actual 4mm part (see pic). So I believe it was getting blocked in the tunnel before getting into the socket. I removed the strings to gain better access. Eventually a cheap 5/32 hex wrench worked, couldn't find my cheap 4mm (5/32 = 3.97mm). It appears the tunnel before the socket is a bit long, so it takes some wiggling to get it seated. Take off your strings, take your time and make sure you feel that it goes in while wiggling. Also, loosen it first before going the other direction, that helps ensure you feel it is seated well.