Check out my earlier thread entitled "Loosening a Frozen Declination Brake" for tips on how I freed up the declination brake on my Questar. To do the jam nut technique of loosening a screw from the threaded side, you'll need 8-36 nuts (I got them from Grainger), not the more standard 8-32 nuts that one typically sees at the local hardware store.
I received the fork today.
The slo motions work fine .
the knob on the fork opposite the fine motion appears frozen, is that not a lock? If so it is locked open. I don't want to force it till I talk to you guys.
See pic of inside engagement
Remember that the tightening and loosening motions on that brake knob are opposite from what you'd expect: tightening requires a counterclockwise turn, and loosening a clockwise turn. So if you're trying to engage the lock using jam nuts threaded onto the brake screw, you'll need to apply counterclockwise force using the nut on the inside part of the screw.
If you haven't already done so, verify what type of wrench you'll need to remove the set screw (either Bristol or Allen -- see this recent CN post of mine). And, as Optics Patent notes, make sure the screw is seated against the flat when you reattach the knob.