Violins strings are primarily tuned using wooden pegs, around which the strings are wound. By rotating the pegs one can tighten or loosen the strings. This changes the pitch of the string. One problem with this approach is the fact that pegs should not be moving after the violinist positions them to his liking. One approach would be to coat the pegs with a material that will increase the friction between the pegs and the pegbox. However, this makes it difficult to turn the pegs and makes their motion snappy, which in turn makes it impossible to target a certain tightness. To eliminate this issue, one can apply a lubricant, but this time it will be impossible to stop the pegs from sliding under the tension of the strings. The solution is to use a soap which acts as a lubricant under motion, but also to add fine angular particles of minerals, which adds extra friction when the pegs are positioned to the desired place. When the pegs move slightly, the mineral particles bite into the wood and stop sliding further. Solving both issues at the same time.