I bought a tool like the one shown below back in 2003 and it has worked just fine. However, I also used CLP on the front sight cylinder and let it sit overnight before sighting in.
http://www.tapco.com/proddesc.aspx?Id=1af17d52-08dc-4fb9-bc40-9f38134201df
On the other hand, if you want windage adjustment at your fingertips, you can get this sight at http://www.sksman.com/part/AK parts2.php (scroll about 3/4 down on the page):
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