replacing rear brk cyl --4ks

[Andrei Kogan <abk@phy.duke.edu>]

Hello,

I was bleeding the brakes last weekend. One of the bleeders froze to the
threads, so I snapped it while trying to unscrew. So, I guess I just need
to replace the cylinder.  The problem is that when I tried to disconnect
the hydraulic line it would rotate together with the nut. I sprayed wd-40
on it, but after an hour it didn't make any difference. The car drives,
because the bleeder is still sealed, but I would definitely like to get
that done before I go on a trip Sunday. 

Question --- is there any trick to keep the line from rotating while
undoing the nut that holds it in the cylinder or should I just scrape it
and replace the line as well?

Andrei