Diverter Gate in front of Orthanc wouldn't return to rest position.

This happened before on the 12th March.  Same problem. Playing a game and the diverter in front of the Orthanc tower stuck and wouldn't return.

• Looked under the playfield at flipper mech for diverter gate. Spring wasn't  able to return the gate to "home" (closed). 
• Binding somewhere at the coil or plunger.  Had the coil moved in the stop? Was the plastic flipper bushing that goes through playfield broken or worn? There didn't seem to be too much "slop" when I wiggled the gate around.
• Rotated the screw for the link connection and the gate could then snap closed.  So it looks like the link to the plunger was binding, 
• Does the metal link bushing needs to be replaced? Maybe, but I reason unlikely given how many times the gate is used compared to flipper flips, so more likely that it was over tightened.  Got a hex key set and loosened the bolt slightly to help avoid binding in future.  
•  Followed instructions to adjust the "Diverter Gate" properly (again), this is found on the inside front cover of the LOTR manual.  Also shown in Service Bulletin #147.  
• Diverter working correctly.  

My personal view:  Don't like the mech Stern has used much.  The main advantage is that it uses standard parts, but the spring seems weak for the task and it seems to go wrong for me occasionally.  The ramp diverter on TZ is a more elegant design.  Stern chose to use cheap existing parts vs. WMS/Bally who could do custom designs back when pinball was making money.