 The Clarinet BBoard
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Author: jim lande
Date: 2003-02-26 03:20
I have been working on a Haynes metal clarinet. This thing has solid silver keys and posts. I had heard about people cross threading pivot screws but never had it happen. Well, I did it to two on this instrument. What do I do now? (Besides take it to someone competent.)
Is this something that happens more frequently with pure silver posts compared with plated?
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Author: JMcAulay
Date: 2003-02-26 04:50
While I have never done anything with (or to) a silver post, either plated brass or "nickel silver" is much harder. Anyway, it would likely be more difficult to cross-thread one of the harder alloys.
All is not lost, as the problem(s) can be corrected, but it will take good skill and just a wee bit of magic (meaning: there's more than one way to do this, and each tech should have his/her own method)..
Regards,
John
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Author: Ken Shaw ★2017
Date: 2003-02-26 14:11
Jim -
Take the instrument to a flute repair tech, preferably one who apprenticed at Haynes. They deal with this all the time, or at least have the background to do it right.
If you're anywhere near New York City, I know a very good person.
Best regards.
Ken Shaw
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Author: ron b
Date: 2003-02-26 23:26
Hi, Jim
Do you have a hard solder setup? Do you have some small taps? If so, you'll save a lot of money))
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Author: jim lande
Date: 2003-02-27 03:27
At the moment I have neither. I called Ed Myers music today and got a few suggestions of things to try before I start buying taps. Given the relatively small scale of my purchases from them, they have been very good about taking time to discuss problems and give pointers.
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Author: Mark Pinner
Date: 2003-02-27 03:49
It needs re-tapping. Someone above suggested filling the hole with solder drilling and re-tapping. This is ok if you haven't wrecked the screw as well and are competent at tapping. Another option is to get a replacement post from Haynes if they have them. The other option still is to re-tap and replace with an oversized screw but you need to find something suitable. Sounds like a piece of bad luck but it does happen. Necessity is the mother of invention. I had a cross threading problem on a Selmer sax the other day, not my doing however, and was able to find a replacement and even replace the replacement with a new part from Selmer. Just lucky!
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Author: Gordon (NZ)
Date: 2003-02-27 13:45
Jim, 'cross threaded' seems to refer to at least a couple of conditions. So some elaboration as to the exact symptom would help.
I assume you refer to a pivot point screw rather than a rod. 'Cross threaded' could mean that you have forced the screw in at an incorrect angle and distorted the first turn or two of thread. In this case the screw may now always guide itself to this incorrect angle, and also be impossible to screw in more than a couple of turns without severely jamming.
If this is the case then you could, while leaving the key off, use the pivot screw as a makeshift tap, screwing it through from the OPPOSITE side of the post.
Then when you return the screw to the correct side, turn it ANTI-clockwise very gently until you feel the slight 'click' of reaching the beginning of he thread. Then, maintaining CORRECT alignment, and with firm pressure, turn the screw clockwise.
Also, for some other conditions, especially when the thread was incorrectly made twice, resulting as a double helix for at least part of the thread, simply turn the screw anticlockwise as above, PAST the most obvious (incorrect) 'click', about another 180 degrees, to a less significant (correct location) 'click'. Then, pressing firmly, begin turning the screw clockwise.
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