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Discussion Starter · #1 ·
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Dear friends,

I've been playing a Yanagisawa 901 soprano for about ten years now, and a 901 tenor, as well.

I noticed that, every six months to one year, I had to adjust one little screw on each, and then each was back to playing well for another six months or more.

On the tenor, it was just a screw that kept a palm key attached, but on the soprano, it was an adjustment screw as such, located on a post immediately beside the upper B key. Apparently this screw maintains synchronization between the funky C-joint key and the upper B key, so when the sync is off, it is critical.

As I mentioned, previously I would have to adjust it only twice a year at most, and very little at that; perhaps about a 15% turn clockwise. However, recently something more serious happened, and I cannot figure out what, nor how to fix it.

Every time I play the horn now, within an hour, sometimes within fifteen minutes, the adjustment screw loosens by about 35%, and oftentimes it is rather sudden, but I cannot figure out exactly when it is happening, in order to repeat it. Even if I could, I am not sure that I would know how to fix it.

The horn had never been dropped when this problem began.

I would just as soon squirt something into the screw-hole to keep it from coming unscrewed, but I suspect that there may be a bigger issue to address first, which is why I am asking you. (In fact, I would not know what to squirt anyway).

I will be grateful for any suggestions that you can provide.

(See screenshot attached, from a diagram in the Antigua Winds "parts catalog", which seems to be of the same design)
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Distinguished SOTW Technician.
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Threadlock is what you need. If you don't have some a bit of clear nail varnish can work.
There are different strengths of threadlock so don't get the one that will make the screw impossible to shift.
 

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Discussion Starter · #3 ·
Thanks, Oric.

I am living in South America at the moment, and probably will not find Threadlock here, even imported.

But if I squirt nail varnish into the hole, will I be able to remove it someday when necessary? Do you mean to say that nail varnish will still allow it to be screwed manually, but with more difficulty?

Do you have any idea what is causing this sudden dislodging?
 

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You can stick a bit on top of the screw and you'll still be able to move the screw afterwards - but you'll need to restick it. If you put it on the thread it'll be a bit hard to shift. The usual trick is to heat it up whcih may require removing the key from the sax. If you're not keen on that sort of thing then just stick a bit of varnish on top so that it'll stop the screw turning. (Make sure it isn't oily first. )
 

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Or you may run a bit of thin thread through the open hole, then screw the adjustment screw back in.
 

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Discussion Starter · #6 ·
Very good suggestions. Thank you both.
 

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Distinguished Technician & SOTW Columnist. RIP, Yo
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Thanks, Oric.

I am living in South America at the moment, and probably will not find Threadlock here, even imported.

....
If there are mechanical engineers or car mechanics, or locksmiths working in your area, then threadlock will be available, probably from the specialists supliers supplying to those trades.
The ideal type is Loctite 222 or other-brand equivalent.
It is also available for on-line purchase, eg
http://www.amazon.com/Loctite-38653-Purple-Strength-Thread/dp/B0002KKTT0 or
http://www.ebay.com/bhp/loctite-222

However do not use this on the pivot rod, because it could seep into the pivot, adding friction that stops the spring from doing it's job.
Simply screw that rod it tighter. If that jams the key, then you need to address that underlying issue.

But yes, nail polish thread, chewing gum, etc are all makeshift approaches.
If anything makes the screw too tight to turn, then heat will release the grip.
 

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Discussion Starter · #8 ·
Thank you, Gordon.
 
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