Shimano Deore LX Front Derailleur Chain Rub - Help!

Hello All!

I have just got a new Scott MC20. The first time I rode it, I noticed
that the outside of the chain rubs against the derailleur cage but only
when the front middle cog is in use and in gears 5,6,7,8 and 9 on the
back. It appears to be rubbing against the part of the cage where the
cage pressing protrudes inwards (the protrusion I guess is for
strength). I took the bike back and the mechanic said he'd cured it. Lo
and behold on the very first ride the problem was still there! This is
very frustrating as the rest of the gears run quietly and without
interference. Can anyone advise how I adjust this out or is it trickier
than it seems? I have a few (not very good!) pics that show where it
rubs. This Shimanophobe would appreciate any practical advice you can
give!!

http://uk.geocities.com/quinkster2001/shimaono_rub.html

Regards

Carl

Try this link.
http://cycle.shimano-eu.com/media/cy...9830565033.pdf

or

http://cycle.shimano-eu.com/catalog/...11792 3297727

Thanks Kenny, I'll take a look

Carl