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As much as I like synthetic knots none of the ones I have are particularly scrubby so i don't think you would like one of them.

Oth if you want to try a boar knot I would get an Omega 10066 for...

Just had a look here https://www.vintagebladesllc.com/shop/Vintage-Blades-Brand/ and it is said to be a 2 band badger knot. Two band badgers are generally known for their stiffness/backbone compared...

With no starting point as a reference pretty hard to advise. A price point would help too. Maybe somebody who has used that brush could help.

Bob

What exactly are you using now?

Bob