I got a dog comb, an all-metal long tooth medium comb, to open up wool locks.
Used it on some glossy adult Romney locks I bought already washed and it worked well. (This is the wool I dyed with Scotch broom.)
Used it on some of the washed brown Romney hogget locks I got last fall. Discovered a tender lock or two.
When I bought the hogget I wanted to make myself something to wear out of wool from Vancouver Island, which it is, but now however I think this particular wool is not for me. It's not just the fact that some of it broke away when tugged, nor merely the tedium of processing, it's that it has a matte texture not glossy and a tighter crimp than I like to see.