I bought a bass used. It came with old strings and I am finally ready to change them. However, just looking at it I am not sure how. Any pictorials on how to change the strings. I've seen 6 string electric guitar tutorials on the net, but nothing about bass. I have a Squire P-Bass if that makes a difference. What confused me is the sring goes around the peg, under itself, and into the peg. What's holding it in the peg?