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View Full Version : Runyon Custom Bore symmetry?

pth
08-21-2003, 10:09 PM
I just bought a tenor Custom 6. I was looking up the hole that the neck fits into and noticed that the boring is not symmetric with respect to the square hole at the end of the baffle. I would have expected the bore to be symmetric with respect to the square. Instead the square hole is very much off-center with respect to the boring from the neck hole. Is this the way the mouthpiece is supposed to be?
retread
08-21-2003, 11:32 PM
There was a discussion some time back about the SRs being that way. As I recall, someone said it's due to wear on the molding machines.
pth
08-22-2003, 12:05 AM
How does this effect the performance of the mouthpiece?
kcp
08-22-2003, 01:04 AM
I have a SR that is that way. After comparing it with other SRs I find that it doesn't change anything. I've had other people compare and they said the same thing; they can't hear the difference.
pth
08-22-2003, 01:17 AM
I really appreciate your responses. I thought that the mp sounded good, but I would have wondered if it should sound better.
gyrofrog.com
08-22-2003, 03:20 AM
With my mouthpiece, it wasn't that the window was off-center with the bore, but that the whole thing is off to one side. The window, facing, and bore are all on a centerline that is off to one side compared to the body of the mouthpiece itself. However I have not noticed that this affects the performance in any way.
MojoBari
08-22-2003, 02:55 PM
I have not noticed that symmetry in the chamber is real important. It probably gives it a slightly unique sound. But how do you test this? I have had a few pieces that look similar except for symmetry, so I have a general impression. But I would not say this is conclusive. I have not done any controlled testing. I have corrected some non-symetrical pieces, but this made the chamber bigger and so the sound was different because of this.
Paul Coats
08-24-2003, 01:56 AM
Yes, the misalignment in the throat area does not affect playing or sound.

I seem to recall, it is not so much wear in the tooling, as much as necessarly loosness to allow the dies and cores to come apart. It all goes together and comes apart like a "Chinese Puzzle", in a certain sequence. The bore core pulls out the back, the chamber core pulls out through the window area, then the two halves of the mold separate. Quite interesting!