Mcmaster Carr has those brushes in horse hair. I bout some 3" long ones. Also have nylon and diferent channels to hold the brushes. I think they were under conveyor brushes.
I need to come up with a new system. Some times I use bits that stick out 3/4" under the collet and other times 4" long under the collet. And I use the full length of the bits. So I have 4" of travel of the bit. Brushes don't deflect that much.
Donny |