6th Dragoon Guards Officers Helmet

[keflin2612]

Hi Fellow Badgers,
I'm looking for some help on a 6th Dragoon Guards (Carabiniers) Officer's Helmet that I have had for some time and I'm trying to refurbish it.
I have two questions,

Number 1) Does anyone know where I can purchase a square securing nut for the plume. "I don't know if they are a standard thread or not."


Number 2) Does anyone know how long the plume should be.

Cheers.
Kev