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The Clarinet BBoard The C4 standard

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Re: polycylindrical bore

Author: Caroline Smale
Date: 2017-02-27 23:53

The Leblanc LL and similar models of the period, The B&H 1010 and 926, amongst many others all have truly parallel bores in the top joint.

++++ at the time of manufacture ++++

During use the failure to properly oil or look after the wood and/or fault swabbing or use of improperly seasoned wood, can readily cause a change to apparent dimensions.

A very common fault is that the bore swells inwards underneath the tenons, but especially under the top tenon, which is most subject to hot moist breath.

It is unsatisfactory to measure the bore very close to either end with a vernier or similar measuring tool as they often give misleading results.
A proper bore guage, capable of measuring all the way into the bore is the only accurate way.

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