Re-knotting with a smaller diameter knot

I like to face lather and I prefer a little more backbone with a little more 'scritch' 

I think Boar is a little too much and most of the silvertip and best badgers are too soft for my liking.   

I have a couple 24mm knots in a black badger from TGN.

The issue is my handles are 26mm.   

The easiest answer is to get the right sized handle, but these are Wolf Whiskers and I like them. So I'm looking to fill a 1mm gap all around.

I am looking for suggestions.   
First - Does anyone have a source for 26mm Black Badger knots?   That would be ideal

Second - if I have to fill the gap, what material should I consider?
I have a metal lathe and make my own razor handles from time to time, and I make a lot of other things too.   I was thinking of brass or copper, but I don't really like the way they look when oxidized and would prefer not to spray them as that hardly ever works.   Carbon steels are out due to the water.  Titanium is too expensive   
That leaves anodized aluminum, stainless, or any one of a number of plastics.   

Have any of you who re-knotted a brush handle did so with an under-sized diameter knot, and if so how did you address it?  

Thanks in advance

I would think a badger knot would bloom out and you would not even notice the 1 mm gap. As for filler, epoxy for a permanent knot, marine-grade silicone if you might change your mind later

I think I’d wrap a thin rubber band around the knot base to give it that extra thickness and ensure center. Or I’d just do my best to eyeball the center and plop it down into a good amount of epoxy.

If I decide on a thin collar of some type - Ill post photos!

Favour the Semogue strategy of a stainless cap with rolled top for aesthetiques.

The hole needs to be 1.5 to 2mm larger than the knot size, you can't stuff a 26mm badger knot into a 26mm handle hole, 24mm is the correct size for that application.

These are fantastic if you feel you must have a 26mm.

https://maggardrazors.com/products/magga...-bulb-knot

Did you do the brush?

Did you do the brush?

I actually reached out to TGN and they are sourcing a 26mm black badger …. The original knot is out and I’m waiting 

I’m actually replacing most of my knots with black badger- I find that I like the exfoliating properties of a more scratchy brush - not a loofa by any means, but some of the really soft badgers are just too soft for me