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Re: Old, loose clarinet screws and keyword

Author: Chris P
Date: 2014-09-13 22:41

Loose fitting screws in their respective key barrels can be tightened by swaging the key barrels with the screws fitted in the barrels, then the ends of the key barrels fraised back to fit between the pillars as swaging not only reduces the diameter but also lengthens the key barrels.

The trill keys are a bit of a nightmare due to the telescopic key barrel (the lower trill key having the larger diameter key barrel that telescopes onto the top trill key barrel), so both will have to be swaged to achieve a good fit on the screw, between the pillars and both key barrels will have to fit well without binding nor the lower trill key wobbling about like anything.

If the screws are loose in the pillars, then the best remedy is to fit oversized screws which involves reaming out the key barrels so they fit and making sure the slotted ends are a good tight fit in the pillar heads. In some cases the pillar heads can be filled in (soldering brass or nickel tubing into them) then reamed out to the correct diameter of the rod screw so it's a tight fit.

If you've got a combination of worn pillar holes, worn screws and worn key barrels, then it's best and much easier to have oversized screws fitted.

Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.

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