I found that the original flipper return frames (metal guides feeding the ball to flippers from the inlanes) on Laser War are poorly sized causing bad ball bounce when transitioning from frame to flipper. Also, the original frames on my machine were badly mushroomed, causing ball hang-ups occasionally and also compounding the ball hop problem.
Wanting to remedy the bad ball hop, I did some research, took a gamble, and happily discovered that Cliffy's flipper return frames for High Speed are a *perfect* fit. With Cliffy's HS frames installed I now have perfectly smooth transitions from frame to flipper. http://www.passionforpinball.com/FlipFrames.htm ... The set was only ~$25--WELL worth it to eliminate the ball hop.
Here are some pictures of the install:
Cliffy Left Return Guide Overhead.JPG Cliffy Left Return Guide.JPG Cliffy Right Return Guide Overhead.JPG Cliffy Right Return Guide.JPG