| To
seal leaks properly on flutes, a
procedure
is used which is called "partial shimming". This involves the use of
little
pieces of paper of different thicknesses (shims), placed under the pad
where there
is a depression in the pad or tone hole. These pieces, generally 1/16"
to 1/2" in size vary in thickness from .001" to .006" approximately. A
tiny piece, like a pie slice, is placed or glued on the back of a pad
or whole round
shim, and when done properly will help to close the gap between pad and
tone hole. These gaps are caused by a not so flat pad, or a not so level tone hole. If partial shimming is not done, the flute is more
prone to leak, unless
softer,
more cushiony pads are used. The soft pads will fill up the leaking
areas
if it is seated by clamping, but will result in a mushier feel of the
instrument,
and the leaks will return when the seat disappears over time. Setting up any flute with harder pads improves the
response,
Air can also leak through the screws and grommets that
hold
the pads
on. It can take a whole day or two to repad a flute in this
manner. |