There are several features you should look for on a flute, especially if you are buying a new flute.
Curved lip plate (metal flute). This makes for easier blowing.
Mouth hole—average size. The two basic shapes used for the mouth hole are the oval and the rounded rectangle; either one is acceptable. The size of the mouth hole, however, should not vary too much from the average. A large mouth hole will favor the low notes at the expense of the high, while a small mouth hole will favor the high notes at the expense of the low.
Integral, rolled tone holes (metal flute). The walls of the holes should be raised directly from the body of the flute, instead of being soldered on, to reduce the chance of having air leaks. An exception is made in the case of some handmade flutes. These are normally fashioned with thinner metal tubing, so most makers do not raise the hole walls from the tube itself.
The tops of the holes should be curled, or “rolled,” so that no sharp edge is presented to the pad—this increases pad life. (Some flutes have tone holes that are integral but not rolled.)
Rib-and-post construction (metal flute). In this style of construction, the posts that hold the key mechanism are not soldered directly to the body but instead to strips of metal (ribs) that are then soldered to the body. This greatly increases the reliability of the key mechanism.
Regulating screws. These allow the flutist to make basic adjustments to the flute mechanism, decreasing the need for professional attention. The flute should have four or five regulating screws; flutes with more than five screws have a tendency to go out of adjustment too easily. Handmade flutes do not normally have regulating screws.
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