Quoted from Breadfan:
The left drain has been driving me,& everyone else that plays crazy. I've dropped the plumb bob down for max nudging,& added star posts,but still no good. I dug through some boxes of old parts today and found this huge bumper post that I thought I'd try. not sure what it went to,but so far it works like a champ. I'll report back after more plays.
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That post is the same as the two posts on a gottlieb Volcano that keep the big metal ball guide in place.