Author: Gordon (NZ)
Date: 2014-05-18 07:15
Another reason I prefer using a feeler (along with blow-pressure-test) is that this checks for equal closing pressure right around the tone hole edge, and on separate tone hole edges for linked keys. A leak light checks for simultaneous contact of areas of pad(s) with the tone hole.
The two are not necessarily compatible, especially for keys with long, somewhat flexible linkage parts, as for F/C-E/B. (And for instruments with very large keys, eg bass clarinet, the prefect compromise is vital.
As far as sealing is concerned, the latter, equal pressure condition, is more important.
Also, for many keys on a clarinet, visual access to check for light leakage is not possible right around the pad.
I think highlighting the required accuracy of all this is important. Differences in closure against tone holes of 0.001 mm (0.0004") constitutes a significant leak.
Post Edited (2014-05-18 07:16)
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The Clarinet BBoard
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