Quoted from Hess:I've noticed after literally 100's of games since getting his / my first machine that the flipper action has been getting weaker. I've read the rebuild guides and all but I'm still not sure what causes this "weakness".
That could be any number of things or any combination of those things. Here are a few of the power robbers that I have seen.
1. Damaged and worn out plungers with mushroomed out ends rubbing in the coil sleeves. Also the coil stops get that way to the point of being hard to get out of the coil.
2. Burnt EOS switches and flipper cabinet switches as well. This resistance can cause a voltage loss and reduce the performance of the flippers.
3. Conical return springs (if you rig still has them) can be weak, broken, or just damaging the flipper link because they are a lousy design.
4. Flipper bushings can be worn (egg shaped bore) even very slightly, causing poor performance.
5. Coils can be breaking down internally and causing weakness.
Everything here is covered very well in vid1900's flipper rebuild thread. Esp. the first several pages. Read and re-read it. Then give it a try. It's not too hard to do with that info. If you run into trouble, just post it to the thread, and you will get help from pinsiders..Good luck