You need to get new bushings and a bushing bit/ driver remove old bushings install new ones. If the threads are messed up you may be able to retap them and you should be good to go. Worst case, you would have to drill and tap for oversized bushings.
http://www.brownells.com/gunsmith-to...s-prod493.aspx
http://www.brownells.com/gunsmith-to...p-prod621.aspx
http://www.brownells.com/gunsmith-to...prod42145.aspx
Or find a smith to do it. 
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