clutch bleed method?

[landl@ix.netcom.com (LYN MARKMAN)]

Air appears from nowhere in 77 Midget hydraulic fluid line between M/C 
and slave.  Visable at top of arch in see-through line.  I'm hoping for 
someone to suggest a method for removing it.  I've tried a number of 
different ideas w/o success and am becoming very frustrated at not 
being able to drive the little guy.  It worked fine for about 2k miles 
but the mystery air is back.  Thanks for anything.