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However she has had a lot of trouble with swollen joints and sometimes the clarinet has stuck together at the end of a band rehearsal.
The newer R13s have this problem. It's something that has been discussed on the woodwind.org forum a lot.
It may be due to the wood not being seasoned as long as it used to be, but I think it's just the cork is a different type and slightly too thick. The repairer probably sanded it down a fraction.
You can help by using a product, thinner than normal cork grease, to keep the cork soft. I haven't got the webpage, but it's called 'Slick' and sold by The Doctor's products. He also sells other things including a bore oil that has amazing reviews.
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But he was most insistent that the instrument could not be overplayed
That's right. There's a phenomenon called 'Played out' which applies to old clarinets, but not everyone agrees about it.
With wooden clarinets, the problems start when you carry it about from place to place. Changes in temp and humidity can make it stick, change pitch, and even crack. You have to get to the venue and leave the clarinet to acclimatise to the new conditions before putting it together.
Of course, in the fresh air, you always use a plastic model!
The R13 is a beautiful instrument. Experimenting with mouthpieces, barrels and ligatures can make it even more beautiful. Keep your eye on Ebay, and if you see a James Pyne barrel, snap it up. They make the clarinet sing!
Steve