Quoted from Bruce:
Odd question but when does the skaker...shake?? I am strongly considering it but its the sort of thing that i don't know i'm missing.....as have never experienced it
For sure it shakes when you hit the vengeance target, ball locks, and for Klingon multi-ball it feels like my whole room is vibrating. I love mine, these machines are easy to add a shaker as the holes are already there for them.