This is the ultimate in tuning keys. The locking feature eliminates the need for multiple string wraps, and trem users no longer need a locking nut that deadens string sustain and all annoying Allen screws and wrenches (added weight). Tired of tying strings? This is the answer. This model is proven to hold strings tightly, allowing the guitar to stay in tune to improve playing enjoyment. The Trim-Lok is a mechanical type locking system that can be used on ANY guitar, including non-trem or acoustic.
Here's how Trim-Lok works
The Trim-Lok is a mechanical locking system. Unscrew locking knob until locking pin inside string post clears string hole.
DO NOT REMOVE KNOB, AS IT MAY RESULT IN LOSS OF LOCKING PIN AND DESTROY THREADS ON LOCKING KNOB SCREW AND MAY NOT SCREW ALL THE WAY IN TO LOCK STRING POST. THIS WILL VOID WARRANTY!
Now, insert string into hole and pull string all the way through post until tight, while holding string screw locking knob in until string is locked to post. Do not over-tighten; finger tight will do. Then, tune to pitch (Approximately 1/2 turn with tuning button). You should be in tune; cut excess string and repeat the process for remaining strings
REMEMBER, there is NO TYING or WINDING of the string on the Sperzel Trim-Lok, which stabilizes tuning. There is less stretching of the string because you have taken the slack out by pulling tightly when starting. Also, string does not have to seat itself.
NOTE! When installing staggered post height sets, there are two short posts, two medium posts and two long posts. Start with high "E" string and work back towards low "E."
The short post ---------- High E & B strings
The medium post ------ G & D strings
The long post ----------- A & Low E string
Rule of Thumb: Always start with the shortest post furthest away and longest post closest to the nut.
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.
This is our non-locking model that requires tying and winding. It incorporates all the precision machining in a traditional style. You can feel the solid integrity. This key was featured on the 25th anniversary Strat.