I had the same problem too. I used a 4 mm hex (allen) bit with a screw driver handle that could takke bits of diffrent types. It also took me a while to but the chirme panel back. The rubber washers kept falling off.Wanted to say thanks for the quick tutorial.
Took longer to get that back chrome panel off than to do the entire adjustement. I need a longer 4mm allen wrench.
Mah baby (2004) shifts like new.