Kanstul B10 cornet backbore

[Louise Finch]

Hi

Does anyone know any supplier who has old stock left of Kanstul B10 cornet backbores?

I know that these were made by Jim New whilst he was still at Kanstul, and I was hoping that he would have the measurements on file to make me another one (I like to carry spare mouthpiece components with me, in a mouthpiece pouch, and have taken my spare cornet backbore for an extra cornet), but he has replied saying:

I do have the tool for the #10 backbore. I am just wondering how much further your kanstul goes in than the Bach. The Bach book calls for .341” on the small end of the taper and the kanstul files say theirs are made at .340” but kanstul had steel gages they fit theirs to, they didn’t measure the diameters closely if the part fit the gage within a tolerance. So I am trying to guess where yours actually are.

Which is obviously fair enough.

I don't have any digital calipers, but if I did and could measure one of mine accurately to let Jim know, I'm not sure what you need to take off to make sure that you replicate the measurements once the new backbore is silver-plated. I have replied to Jim New asking this. Presumably he knows the answer.

I worked with Mike Prestage who was active on this forum at one stage, regarding cornet sleeves. He is/was a UK tech, and was at the time doing custom mouthpiece work. He made me a number of cornet sleeves in raw brass, to avoid measurements being affected by different thicknesses of silver plating.

Anyway, as brilliant as Jim New is, rather than complicating things by trying to remake something with different equipment, that may gap differently, if I could find someone with new old stock, that would be easier.

Many thanks

All the best

Lou
_________________
Trumpets:
Yamaha 8335 Xeno II
Bach Strad 180ML/37
B&H Oxford
Kanstul F Besson C
Yamaha D and D/Eb
- James R New Custom 3Cs
Flugel:
Bach Strad 183 - Bach 3CFL
Cornets:
Yamaha Neo + Xeno
Bach Strad 184ML
B&H Imperial
- Kanstul Custom 3Cs

[Mike Prestage]

Hi Lou,

I'm sure it won't be a problem for Jim New to account for plating thickness as he will have a regular plater who works to his specs (or maybe even do it in-house?) Back when I was doing mouthpiece stuff I tried to avoid plating when I was aiming for a very precise insertion depth because it created an extra headache but I was sending small amounts of work at a time to firms who mainly catered to the jewellery trade.

If you have any backbores (of any model) made by Jim New post-Kanstul, you could take a comparitive measurement of the insertion depth with your Kanstul B10. That would give him what he needed to recreate the B10 shank precisely, and it's much easier to make depth measurements that are accurate enough for what you're looking for than it is to measure the end diameter accurately enough. (Any difference in diameter equates to twenty times that difference in depth.)

Mike
_________________
www.facebook.com/MikePrestageTrumpetTeacher

[Louise Finch]

[Louise Finch]

[Mike Prestage]

Hi Lou,

You're welcome. Tracking down a Kanstul original sounds like a better bet than measuring the shank diameter for Jim New (or anyone else) to make one. Good luck with the search

Best wishes,

Mike
_________________
www.facebook.com/MikePrestageTrumpetTeacher

[Louise Finch]