Ford Fiesta sterring rack oil leak

I have traced the leak to where the 2 pipes go into the rack, there is a bolt that holds a plate that holds the 2 pipes in place the problem is the threads have gone inside the rack so the bolt won't tighten up fully causing a slight leak, is there any way round this without replacing the whole rack as the rest of it is working fine (seems a lot of work just for 1 bolt hole) If i do have to change the rack what sort of job is it? there is a big plate with all the suspention parts bolted to it does this have to come off aswell or does the rack come out with that still in place, i would be doing it on my drive with a set of ramps so need to know the easyest and quickest way possible, any tips would be great. Thanks