On the eclispe front mount there should be two small set screws, these hold the reg in place. Lossen these and the reg should drop out (you proberly will have to pull the hose free from the elbows going between the reg and the front of the body). Inside the mount will be a set screw undo this will remove the reg mount and free the front of the trigger. Then remove the back screw and the trigger should come free, just watch the wires for the battery as they go through the trigger (may be best to remove the battery first). You shouldnt have to remove the solinoid housing from the main body to do this.
adjust the trigger then put back together is basically the reverse
cheers
Bruce