Wednesday 29 November 2017 at 03:29
Now I see. The drive arm assembly (A-7420) has a worn spot where the teeth hit it over the years. The groove allows the arm to travel about 1/8" past the edge of the sprocket enough to hit the post on the sprocket causing it to stop. Apparently this machine hasn't scored past 10K bonus in a very ...
Source: http://pinside.com/pinball/forum/topic/williams-space-mission-bonus-problem#post-4097170