I just finished replacing the junction block on my 240 and i used a brake bleeder I made for $2.50. It works well and cost next to nothing. I used a 2-liter bottle, 2 1/8" hose barbs, and a vlave from an old bicycle stem from a inner-tube. I wrapped all the hose barb threads with teflon tape to prevent leaks, and it worked. here is a pic to show how i did it. I just used a bicycle pump to pressurise the system.

nathan