Or you could just upgrade your tensioner pulley to a newer one that has the
flats on it so you can use a wrench to tension it.  That way you get a new
tensioner pulley (didn't you always want one anyway) and don't have to buy a
special tool or do wierd things with nails or small allen keys (like I do) in
order to tension your timing belt.
Just an idea.
Ken Wilford
Van-Again
John 3:16