There are several types of guitar machine heads.
Now let's talke about the methods to change the full-closed machine head on your guitar.
Firstly, we need to take the original machine head down from the guitar.
Three steps:
1. Loose the string and take it down from the machine head.
2. Screw off the screw at the back.
3. Loose the screw in the front and then we can take the old machine head down.
The steps to install a new machine head is just in reverse order of above steps.
The first step is placing the machine head and fasten the front screw nut.
The second step is screwing up the screw at the back.
After that, install the string.
