Ford :: 2000 - Cleaning Steering Box Sector Shaft

2000 Crown Victoria, 172K I recently tore into the car's steering components because just about all of them were pretty heavily worn out (including one brand-new tie rod that already busted its boot). I got everything out fairly easily except for the pitman arm: That thing broke THREE pullers trying to yank it off the sector shaft. I finally had to get an angle grinder and cut the thing off, which I did by slicing away metal on both sides until I was able to pry it off. It looks like that despite being as careful as I possibly could be, I nicked the sector shaft in a couple of spots. One is a small spot at the bottom of the threaded part for the pitman arm nut, which is making it tough to get the nut to bite. Another is at the top where the pitman arm engages the sector shaft splines. Two questions: - Is there a really large tap-and-die set somewhere then I can use to clean up the threads? Never seen one this size before. Failing that, will using a small file be enough to deburr the threads and allow the nut to engage? - Will the nicks on the splines cause trouble with getting the new pitman arm seated properly?