modelo sound-lok
de mecanismo abierto tipo vintage, con bloqueo
lo compré para un proyecto, pero se quedó en el cajón.
imagen mejor que mil palabras:

no es el típico de bloqueo, esto es lo que dicen en la web oficial:
http://www.sperzel.com
This is a more friction-passive positive locking system which still eliminates multiple wraps around the string post. Usually a 1/2 to a full wrap locks the string tightly, improving tuning stability for any kind of guitar.
Here's how Sound-Lok Works
The Sound-Lok tuner is a friction lock system, and has the look of vintage safety posts of the past, where you had to measure the string and cut to length. This was very time-consuming and wasteful, especially if you cut the string short.
The Sound-Lok needs no measuring; simply insert string into the hole by the slot and feed string all the way through the shaft until it comes out the bottom of the post. Pull the string until tight, then bend the string so it lies in the slot on top of the post. With your thumb holding the string in place, tune to pitch with tuner button (Approximately 1/2 - 1 full wrap is required). The string will automatically grab and lock into place. Cut any excess string and repeat for remaining strings.
lo vendo por 45€
vivo en madrid.
salud!
