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Leveling Flute Tone Holes
The Thomas Flute Jig
Leveling tone holes- a new era

This lighted gauge makes it immediately clear whether or not a tone hole is flat enough to allow a pad to consistently seal with very light finger  pressure, and do so over a long period of time.
In this picture we see a tone hole that is far from flat, but sadly, unless made by hand, this is about as far as most 
manufacturers seem to go before a flute leaves their factory. This tone hole would likely  seal with moderate finger pressure for a few  months, at which point it would begin to require the payer to get into the habit of using a "grip" rather than a "touch".




                    Above is the business end of the Thomas Jig- four separate receptacles

 for varying sizes of polished, hardened steel balls. The depth of each is adjustable.


 After sliding the flute over the precision ground mandrel, with the target tone hole positioned over
the chosen cavity, the appropriate sized steel ball is dropped through the tone hole and into the cavity.
If the flute is now turned clockwise on the mandrel it will stop when the ball, which protrudes slightly into the tone hole, comes into contact with the inner wall of the flute, directly under the low spot that we diagnosed earlier. This contact point can be menuvered quickly and easily by hand, and by using light hand pressure, the tone hole wall is lifted at any specific point chosen.

      In some instances a lone high spot can be altered with this tool, made of  a hard polymer.



Using the same mandrel location as above, this accessory affords a

high degree of control in restoring tone holes that are out-of-round.






Feldman Music

61346 King  Jehu Way
Bend, OR  97702

541 382-9390