On my '87 Carrera I used a pair of vice grips on the end of the plastic tubing. It was easy to find the tubing (under the car - in front of the left front tire) I just looked up from the rapidly forming puddle that occured shortly after starting to pressurize the master cylinder.
I used a power bleeder from Motive Products -
WWW.MotiveProducts.com - $44.95
Great product! They also advertise in Panorama.
Charlie '87 Carrera