Fettling is probably not quite the right term, but I popped in to a colleague's workshop and availed myself of the 6" engineer's vice he's got bolted to a nice heavy bench that isn't going anywhere.
My Raleigh roadster forks were clamped tightly in and a length of scaffold tube slid over the end of the LH fork blade and a little gentle persuasive pressure applied, until I had lessened the amount of accident damage misalignment. The blades/dropouts also had a bit of twist in them, so they were not quite at right angles to the fork crown, which caused the wheel to point at a slight angle when the steering was set straight ahead.. I clamped each dropout in the vice in turn, and used a length of flat steel bar inserted between the blades just below the crown, to twist each blade until the crown axis looked to be at right angles to the dropouts.
When I got home I trial fitted the front wheel in the fork, which revealed it's much better, but still needs a bit more tweaking before I'll be happy with it, plus the RH dropout needs filing slightly deeper to compensate for a small difference in the effective length of the two fork blades. I'm just thankful it's made of steel and not carbon fibre!