What weird mods have you discovered on the games you have bought?
I have two examples:
1. Aces & Kings (Williams 1970)
Someone used a saw to make a passage to the shooter lane. And later, another owner seemed to have wanted to reverse it by putting a post there. I am thinking about removing the post and keeping the passage open.
2. Funhouse (Williams 1990)
A center post has been placed between the flippers. I will remove it.