yep,thats how I do it.
You can buy the tool for attacking the adjuster on Ebay,costs around £17,I think.The 916/996 bikes used to get one in the tool kit.
Just as easy to turn the chainguard tho!
BTW,Its very easy to overtighten the chain,so be carefull.
[Edited on 20-11-2005 by KeefyB]