DJKYrtgfsRFw on "Twilight Zone screw?"
Wednesday 14 February 2018 at 06:56
1) You don't need to 'level' the upper playfield. If you level the machine correctly then the upper playfield will level correctly and balls will NEVER get stuck in the corners. I'd love to flying clothes-line the person who put in that screw 
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...Source: http://pinside.com/pinball/forum/topic/twilight-zone-screw#post-4229364