I've been working my way up to the Deadworld lock mod. Fixed my trough/shooter lane errors; first by installing new GL opto boards (which didn't fix it) and then replaced the lane microswitch (which DID fix it). Now, I've got the left shooter lane experiencing the same error infrequently, where it doesn't recognize when a ball rolls down there, so I'm going to swap that switch as well. That'll be the last known issue and I'll be purchasing the mod too. Probably a great idea to get everything up and running without errors before you do the install. I think it looks great and look forward to playing the game as it was originally intended by the designer. Good luck!