I'm over at my friend's house and his shadow pinball has an issue with the left diverter. We replaced the coil sleeves and it still acts like this. When the diverter is all the way to the right side then it will move to the left like it's supposed to, but not if it's in the middle. See video here

Does anyone know what I can do to fix this? Thanks!

I'm wondering if this is the problem. I found that the could back plate was not perfectly up against the coil. I took it off and found that the metal is splitting. The spring seems good.

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Actually.. it works fine from under the playfield.. it must be how the Allen screws are gripping the shaft from the diverter?

The screw is all stripped.. we can't get it to move. Not sure what my friend plans on doing. Thanks for all the help.