Metal tenon.
L&P Metal tenon


Metal socket and tenon sleeve at middle joint
Removes wobble between upper and lower joints
Increases response and projection
Adds consistency of tonal color
Provides more even resistance in all registers

The Problem:

When assembling a clarinet most clarinets have just a simple wooden top-joint tenon which needs to be pushed into the lower-joint receiver. Most tenons are slightly wider at the top and a thick tenon cork should hold the joints tightly together. This is the simplest and most inexpensive production, but comes with several disadvantages.


1.Water will enter the socket at the end and will cause the tenon to swell. It is not uncommon that new wooden instruments are hard to ensemble after they have been played for a while. The extended tenon will not fit properly into the lower joint receiver because the tenon cannot extend in the same degree. The metal ring around the receiver will prevent that from happening. As a result, the instrument cannot be properly assembled. You will end up with a gap at the bottom and more water will collect inside the gap. To solve this problem, the wood at the tenon will need to be removed, which in turn makes the tenon thinner. After some months, you will experience the joints starting to wobble. A new thicker cork could then help temporarily but the wobble will come back after some time.

2. The original tapered tenon joint requires you to push the joints all the way together to ensure a proper fit with no wobbling. This prevents you from improving your intonation if the instrument gets warm. The increased temperature will make your instrument sharp. To adjust your intonation, you could pull out the barrel, but this will have a bigger effect on your left-hand notes and less on your right-hand ones. A better solution would be to pull out the barrel a little and the lower joint as well. This cannot be done on a tapered/conical tenon, but it can be done on a precisely fitted cylindrical one.

The Solution:

The LP-Metal tenon system

A better solution is a fitted metal tenon which doesn’t allow any wobble, one that connects both joints securely. It allows you to pull out. It doesn’t change depending on your playing or if the humidity changes. Our tenons are so tightly fitted that the body is fitted like it was made from one piece of wood which also increases the resonance.

Through the installation of a precision metal socket and tenon sleeve to the middle joint of the clarinet, the two body parts will be connected like the body was one piece.

The socket is manufactured to fit snugly to the tenon. Due to its cylindrical shape you can pull out the joints without risking a leak or wobble.

This provides for a better seal and a consistent sound with even resistance throughout the scale. This is especially noticeable in the clarion register. The sound will be more focused and the response immediate especially in the altissimo.

How it works: When you blow into your instrument to produce a note, your air column causes the instrument to vibrate. You will feel these vibrations in your fingertips. With your air and the resonating instrument you have two vibrating systems in action that will influence each other. This will produce additional overtones and enrich the sound.

By connecting the two body parts very tightly you increase the mass that has to vibrate. The very first note will therefore take a little longer before it has its full sound quality. Once the vibration starts it will take longer to stop vibrating requiring less energy to play the next note. This phenomenon is well known. It is easier to slur to some difficult high notes than to attack them.

On special request we can also apply this technique to all the other tenons, improving the response even more.

(C) 2014 - by Lohff & Pfeiffer - Brøndbyvej 211 - 2625 Vallensbæk + 45 3535 8643 - SE DK 189 57 485