How do you secure the Carbon fiber blade in your hilt so you can use it to duel with

[Lobezno]

Since you only need an adapter with fairly simple (and known) measurements, you could probably get it 3d-printed in a durable plastic of some type.

You mean like the one I posted in page 2 with pictures?

[Silver Serpent]

Heh, yeah that's exactly what I'm talking about.