Lead pipe fixing screw for INDERBINEN SERA

This is a custom-made screw for the leadpipe of the INDERBINEN SERA flugelhorn, a handmade instrument from Switzerland.
It is made with RawBrass specifications, just like the instrument itself.

INDERBINEN instruments are already perfect in terms of playability and appearance in their standard state. However, I personally felt that this particular screw was too ordinary and wanted to do something about it.
I was concerned about ruining the excellent playing feel of the original by making a poorly designed replacement.
After much trial and error, including repeated prototyping and testing, I found this specification to be quite good. I have play-tested it for about a year and have determined that there are no issues. Therefore, I have newly manufactured them and am now offering them for sale.
Photo 3 shows an example of it attached to the SERA body.
The instrument is not included.
This listing is for the screw only.

It should also work with the WOOD model, which uses the same design screw as standard, but due to a potential issue with the installation direction, I felt it might not look as good on the WOOD, so I have designated this as SERA-exclusive.

Thank you for your consideration.
You might be wondering who would buy this (lol).