Along these same lines of making your own tools...A garden sprayer and an old brake fluid
  cap makes a great pressure bleeder. I can dig up the plan for it somewhere if anyone wants
  them. They are written for a bmw but just subsitute the bmw cap for a vw cap. Makes
  one man bleed jobs a breeze.

  Monk

Tabe Johnson <greentabe-vanagon@YAHOO.COM> wrote:
  If you're a cheap bas... uh, I mean value driven like me,
you can gut a used cap to remove the valving and attach an
air compressor or hand tire pump to the pressure tank. Apply
your chosen pressure (I'm thinking 50PSI is NOT a good choice!)
and look for leaks. Beats the heck out of the $50 pressure
testers for sale.

tabe johnson/87 westy