The string keeps slipping at the locking nut, what can I do?
Locking the strings securely at the nut end requires a little bit of getting used to, to find a balance of tightening hard enough to hold it, but not too hard so that the string breaks.
The materials used in the construction are carefully selected to make this as robust as possible, but in the event that you are having problems, here are some things you can do:
- Using a hex key, it is possible to exert a significant force on the string lock. Only ever tighten the string locks with a conventional "L" shaped key "standing up", ie. use the short end of it to turn it. If you use the long end, it is easy to overtighten the screw and either cut the string, or even damage the wood of the guitar. An approximate torque setting is 1 Nm/0.74Ft-Lb.
- When you are changing strings and insert them through the string locks, pull the string tight with one hand, trying to keep it centered within the string lock hole, while tightening the locking screw.
- The material in the screw that fastens the string lock to the guitar is hardened steel, and the "star" groove for the screwdriver effectively acts as a knife that can cut your strings. For this reason, our string locks are fitted with a small stainless steel disc that protects this surface. I.e. the string should be pressed between the locking screw and this metal disc. Unscrew the locking screw all the way and ensure that there is a small flat disc at the bottom of the string lock. In the event that this disc is damaged, it might cause the string to slip. You can try to flip it around so that the other side of it faces up.
- The alloy used in our locking screws is still softer than the material of (most) guitar strings, so it can be deformed and burred over time. Worst case, a burr can become sharp enough that it actually cuts strings during string changes. This kind of damage to the locking screw is easy to polish out with sand paper. Look at the bottom of locking screw and periodically inspect it for damage. If the screw becomes too worn, it might not grip the string securely.
If the disc is missing, or a locking screw is damaged, look inside the other string locks. You may safely swap screws around or move a metal disc as a short term solution. If you need spares, contact support and ask for replacements.