Had my Shadow for about a year, and the previous owner had covered the Sanctum with a hotel rewards card to hide damage. Game played 100%, and Sanctum lock worked everytime.
I decided to patch up the Sanctum (filled hole, painted, decal, mylar). Since I have done that, the magnet was first too weak to throw the ball back into the lock. I put in a new magnet core, and adjusted, and now, the ball doesnt get thrown back at all. I also tried setting the pitch higher, but that didnt do anything. Basically, the ball stops like normal, but doesnt release properly, and get thrown back into lock.
Any ideas of additional things to check? Also, does anyone have a picture of their magnet area under the playfield? I have a random coil by mine that im sure should be there, but it looks out of place.