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With some CA glues you can control and prolong the setting time with linseed oil I think it was.
Adding a tiny amount of filler might also help, in your case finely powdered ivory or anything ivory...

Found this about ivory; Guitar Parts - Bone and Ivory Working Tips

Either way, it depends on the ivory how "springy" it is, but it's really easy to do.
It can also be done with chemicals but I don't remember really how to do that and my books are in a chaos state...

Good, what kind of world would it be if everything everywhere where the same...

Ivory and walrus can be bent if you soften it with steam or in hot water, you will feel when it starts to give and...

I wouldn't know, I use the metric system! ;)
So should the US since Congress passed the Metric Conversion Act in 1975, hehe.

And your link were much better than my stupid Cites thing, Cites is...

Somewhere in here; Welcome to CITES

Both walrus and ivory are such nice materials, to bad the animals have to suffer.
Could you give us some more pics of it, I would love to see all of it.

Soon we all have a microchip imbedded in one of our teeth...

My vote is for sterling silver liners!
You can get silver hard as steel if you like, yes it can be tempered but work hardened by rolling would do.

As with all bone and horn, you never know until you start cutting it up.
I would love to have some walrus to play with, had pieces of it but mostly customer supplied (museums).
It's illegal to sell...

If I would add a liner I would go with something that could have been used at the time, brass o silver could be nice.
I do think you can get away with just superglueing it, 2 very small metal pins...

Any pictures?

2nd....