So, my buddy is gonna make me a custom brush handle, but neither him or I have much experiance with building brushes. I KNOW I'm going with The Golden NIB Silvertip Grade A Badger in a 22mm. I've read that you want to go 1 or 1.5mm larger than the actual knot, but what about depth? I assume the deeper you put it will probably make it stiffer, but is there kinda a rule-of-thumb one goes by? I also know its better to go shallower 1st then deeper if needed (easier to take away than add to). Im gonna order the knot now, but he wants wants to go ahead with constructing the handle.