Re: Highest quality replacement tuners?
Why not a "bolt action"-style locking lever
The physics/mechanics is basically the same.
It is a rope under tension similar to the string under tension, wound on a pipe like a string wound on the tuning post.
You can have a jute rope or Nylon rope or a steep rope.
A smooth steel rope or a steel string wound on a smooth iron pipe or polished tuning post does not have adequate friction to generate the resisting force. Lack of friction is a simple reason why a Nylon rope slipes while a jute rope stays. But a jute rope does not have the same strength as a Nylon rope and so will break sooner. A steel rope will take more load than a Nylon rope before breaking as steel is stronger than Nylon.
The tuning post can be made rough instead of polished chrome and that would make it just like a rough iron pipe.
One end of the rope or the guitar string has the weight or it is attached to the bridge, causing tension at this end.. The other end of the rope or string is wound around the pipe or post and this end is free as in the guitar and as shown in one of the images. What is holding this end or preventing this end from slipping is the friction. More turns exponentially increases friction, reducing the need to secure this end like a person holding the end in that image.
Lets take out the guitar wood effect on tuning. i.e change in room temperature and humidity can cause the wood to deform and change the tension and hence the tuning. What else can cause the string to unwrap? Well vibration in the string due to just playing or excessive use of the whammy bar can and that will loosen the string.
Now if the other end of the string is secured, then the winding or turning is not required, like in locking tuners. But how well it is secured depends on how well the tightening of the thumbwheel holds againts a thin string. It is hard to press against a very thin string and hold it in place and this is probably why the thin strings slip when using locking tuners. The thumbwheel does get lose due to vibration and all it needs is a little gap to cause the thin string to slip.
One may frequently have to tighten the thumbwheel to keep the strings locked? May be they could use a locking washer like you use with bolts/nuts. You know the one that is slit and twisted and becomes flat when you tighted the bolt.
Why not a "bolt action"-style locking lever