Thanks moraine and Mike Tangas,
I'll get the hose tomorrow together with the filter and some MB fluid, as I might as well flush the steering pump (as per Larry Bible's post I read in the archives) while I disconnect the hose. I'll prob. replace the other piece of hose as well while I'm at it.
Here is a picture of the stem with me pushing the plastic down to see the nut better. I assume that's the one that needs to come out.
Don't you love those digital cameras...?
Thanks again for your help.