not sure about a special tool, but if I remember I think I used a large socket to help tap it in evenly. A large washer may work. I did use some type of rtv on it I beleive...helped lube it as it went in and ideally would help keep it in place once in. I found a thread out there (Or maybe I created on on it myself and somenone suggested it...not sure what type/color I used anymore)

I'll repeat, I took a long time getting mine in...as mentioned it just wasn't as straight forward as I orginally thought (just getting it evenly was the tough part...maybe whatever this tool is helps on that).

Chris