Carding wheel....on my never ending to do list. I still card by hand using mostly steel wool but at times carding brushes as well.

Most time when I blend rust blue out I darken the area where I did my work to close the same color as the barrels then put solution on everything a time or two until I get the desired result.
Steve

http://www.bertramandco.com/
Booking African hunts, firearms import services

Here for the meltdowns