I've been swimming in brake fluid all day, but finally all the leaks have been fixed.
Ron61,
It appears that there is a nipple on the side of the reservoir over which the rubber hose fits. At the other end of the rubber hose, the hard brake line is simply inserted. I can't swear to that, because I didn't remove the hose. That line supplies fluid to the clutch slave cylinder.
Ron Randall,
Good to hear from you. It seems the problem with the clutch slave fittings was that the line was wedged against the frame and between some other lines. As a result, the fitting was not sitting perfectly flat. After a few adjustments, refittings and swear words, I finally got it just right. I was on my last try when it quite leaking. Lost almost a liter of brake fluid in the process. Also had leaks at the front calipers because of my own stupidity.
I had attached the brake hoses with the wrong side against the calipers. (See my motto below.)
Should be firing the car up soon. All the assembly is done.
Best regards,