I have been working on my latest edition, Lord of the Rings. The one thing still not working is the Barad-Dur tower in the right corner. It comes down but will not go back up unless the pin is shaken hard. I replaced the old Williams coil with a new Stern. The spring is not available. I got a couple from Marco that are not a good substitute as stated. They are a bit longer but are weaker. I used the old spring. I set the game so the tower will not fall early. I took the tower out to replace the coil. Should the sleeve stick out the bottom more to prevent the tower from going down as far?

Shortening the spring will not make it stronger. The coil wire would have to be thicker and the number of turns greater and closer together. So the problem is the spring.

Thanks. I am using 2 of 10-326 springs inside each other to make it stronger. The original is a bit shorter and stronger than a single 10-326. This spring may not be original. The coil had been replaced. The tower now falls down and comes back up part way to a resting position. It will return upright if the ball hits the hole behind the tower. Better! I put the setting back to no early fall.
If the coil sleeve is left long to come out of the coil it would stop the tower from coming down as far. Is this how it should work?

Just looked at the manual. It shows the coil sleeve does not come out of the coil.

I have now replaced the double spring setup with one spring. I used a new heavy duty Balrog spring. Part 266-5076-00. It is a bit shorter but stronger. It works great. The tower comes down and goes back up on its own.

Balrog spring still working. Tower is set to fall early and works flawlessly multiple times a game.