I don't believe this has locking studs. I took the
tremolo out and the treble side stud wobbles very slightly and is very easy to turn with my hand. The bass side stud does not wobble at all and is difficult to turn without using a tool. I have to use pliers to turn it because it is too stripped to use the allen wrench. There is a small dent on the bass side
knife edge from contact with the post as well. The posts do look pretty worn and I think replacing them might help a lot. Also, I tried the chapstick thing but it didn't help.