That's the same as the original tremolo, its to replace broken ones. If you want to use that tremolo without the strings going out of tune very much, invest in some good locking tuners. If you can get the ones they use on custom PRS's, get them - they work great.
Quote by DevilsDance76
rigeljs is on the money...

PRS 513 Mahogany>Fulltone Clyde Wah>Tonebone Classic>MXR Dyna Comp>ISP Noise Decimator>Boss TU-2>Mesa Lonestar Special