If I remember correctly the top rollover score changed in a random manner when a passive bumper was hit and the extra ball and 500 pt shot were not as common as the lower scoring awards.

On the center drop target it would lite for extra ball each time the other four drop targets were lit and I think it would advance the scoring award there each time you did this and hit the drop target.

The hard shot on the game was collecting the rollover extra ball on a plunge without hitting one of the passive bumpers first which would change the award. The upper drop targets could be difficult to hit as well, especially the right one.

I had to look at the schematic but it looks like the 10 point lites are tied into the 300 pt relay and the 50 pt. lites thru the advance unit when 500 pts is lit.

If you can find an original set of bells then it be complete.

Edit - maybe this one has a chime in it ? I kind of remember the one I had might of.

I remember now! I never noticed that until Bruce came to pick it up. Must have been one of the first to use a chime.

When I got it, it was all working so well that I'm not sure I ever noticed it. Playing it, it was hard to tell it was even a chime and not a bell. Very cool indeed.

I think that's tape. Should peel right off. Used to be my machine, but I don't remember to tell you the truth.

I would get rid of those tall bulbs and put 55s in there instead.