Can anyone tell me how to remove the lower legs on 2001 Marzocchi z1 Drop-Off forks? Can't find any guide on the internet, but I'm generally rubbish at googling etc.

A general guide to Z1s

http://www.mountainbikerides.co.uk/fettling/z150.htm

Hmmm, the rebound adjusters of mine are where the lower bolts are in that guide. Guess I'll have to hit them repeatedly with a hammer or something until they come off…

do the knobs come off if you undo a grub screw – usually they do leaving a nut you can then undo.

Have you had a good search around the 'zochhi site? some instructions are on there

I'd looked at the 'zocchi site but not found any actual servicing instructions. Turns out I just needed to pull the rebound adjusters a bit harder then the lowers come off 🙂

I'm a numpty sometimes!

apparently marzocchi were rather cagey about service guides for the 'layperson'. I remember having to trawl through MTBR last year sometime for links to unofficially hosted pdf's of dealer service guides.

You're not wrong there.