The compelling value to me is solely ergonomic--I despise the tiny finger-contorting flat-tab neck screws. There are alternatives from Meridian Winds and Westcoast Sax and elsewhere, but the Yanagisawa lovely round knurled large-easy-grip screw has an elegantly-engraved logo, so why not use it on my Yany tenor?
But TWO accessory inserts (which each display the logo) are provided, and as-designed one will be left over and possibly discarded and lost. As I looked at my neck, I had a thought: it looked unbalanced with a finely-machined device on only one side.
Why not put the unused insert on the other side?
Unfortunately, on the Yany anyway, the screw is too long: it interferes with the collar-tightening screw and so sticks out with exposed threads which looks weird.So, it must be shortened about 3mm. You may have more elegant tools, I gripped the excess threads with pliers and used a hacksaw and then file to clean the burrs.
Now, all pieces are employed and there is lovely symmetry to the neck collar. A bit more mass too, if that floats your boat.
The end plug is hollow to permit optimum evaporation of remaining moisture from the horn bore after play and swabbing. Key Leaves provides great high-tech solutions. But I like the new-yet-vintage plugs from Morgan Mouthpieces which are claimed to be turned from 60-year-old left-over granadillo rod stock which Ralph Morgan used to make the end plugs provided with Selmer Paris horns until the 60's when they were replaced by plastic.
But TWO accessory inserts (which each display the logo) are provided, and as-designed one will be left over and possibly discarded and lost. As I looked at my neck, I had a thought: it looked unbalanced with a finely-machined device on only one side.

Why not put the unused insert on the other side?
Unfortunately, on the Yany anyway, the screw is too long: it interferes with the collar-tightening screw and so sticks out with exposed threads which looks weird.So, it must be shortened about 3mm. You may have more elegant tools, I gripped the excess threads with pliers and used a hacksaw and then file to clean the burrs.

Now, all pieces are employed and there is lovely symmetry to the neck collar. A bit more mass too, if that floats your boat.

The end plug is hollow to permit optimum evaporation of remaining moisture from the horn bore after play and swabbing. Key Leaves provides great high-tech solutions. But I like the new-yet-vintage plugs from Morgan Mouthpieces which are claimed to be turned from 60-year-old left-over granadillo rod stock which Ralph Morgan used to make the end plugs provided with Selmer Paris horns until the 60's when they were replaced by plastic.