restoration in progress

I have been deciding how and run to restore my rubberset for some time. I finally got to removing the bristles and smoothing out the hole, I noticed something shiny. There is apparently a small brass ring inside. Now the question is, do I want this brass ring? It is only about 2mm wide and thickness unknown.

I am ready to measure and buy my knot, but I do not want to try to glue in the knot and learn the ring is my enemy.

Could you please take a pic of it?
I remember that a Vie Long brush (boar brush) that I restored had a metalic ring too and I removed it with no problem at all.Now the brush has a TGN finest badger knot.