Bauhaus have rebuilt the action in the A.I. (action improved) series using a shoulderless point screw and redesigned pillar-rod mechanism. The screws are manufactured from hardened steel, and the housing mechanism is carefully engineered around them creating greater ergonomics, making for a smoother, more responsive action. Read on to learn about point screws and see the new "AI" cases.
Most keys articulate with the body of the saxophone via a combination of pillar, rod and screw.
The majority of modern saxophones are made using pseudo point screws. "Pseudo" point screws are shouldered and fit within the pillar and the key rod in a certain way: the head of the screw sits on a ledge inside the pillar - and can go in no further - the lower half of the screw sits inside the rod.
The advantages of a pseudo point screw are that the saxophone is easier to manufacture - the engineering of the rod and pillar does not need to be as precise, and manufacture is cheaper; less work is involved and fewer different types of parts are needed. Many good modern saxophones are made in this way, with slight variations on the type of screw shown above. The mechanism is fine, so long as everything fits together well. However, a possible problem with this system is "loose" key action through unwanted vertical rod movement. This can occur from the point of manufacture, or more gradually. Over time, especially if a saxophone gets a lot of use, the inside of the rod can become worn, so increasing possible horizontal and vertical movement of the key rod. There are ways of resolving this: hammering in the pillars to take up the slack; or swedging the inside of the pillar (removing the ledge on which the head of the screw sits) so that the screw can go further into the rod. These methods are initially effective, but might cause weakening of the mechanism over time. Back track a few decades and you find the majority of saxophones made with a different type of screw.
Bauhaus-WALSTEIN have changed the type of point screws they use on their bronze "AI" instruments. Instead of using the "pseudo" point screw, they are now using a "shoulderless" one.
The shoulderless point screw is not especially pretty. It is the same diameter from head to the beginning of taper and threaded the same distance. The screw is made of hardened steel, which means less burring with a screwdriver, and very little chance of it breaking off in situ. The pillar that houses it has no ledge and is threaded throughout. The taper of the screw rests on the internal wall of the key rod and pivots.In terms of key action, this means little or no "play" in the key rod and a generally smoother action from the first. Unlike the "pseudo" screw, as the mechanism wears, the shoulderless point screw can be simply tightened taking up any slack in the action without having to ream or swedge anything....
This change has meant redesigning of the point screw, the pillar and the keyrod, which, in turn has meant much new equipment and work for the factory. In all it represents something of a first for modern saxophone manufacturing. With the "Action Improved" Bauhaus Walstein Saxophones you get improved, hard-wearing, ergonomic keywork, the same great sound, and.....
Bauhaus-WALSTEIN | The Deluxe Series
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