Hey all, I've posted in the past (and others have confirmed) that the inner orbit shot from upper flipper often does not make it around and instead ends up in the VUK to the upper playfield. I've never been able to make more than four consecutive loops, and even that's very difficult. So yesterday I removed the BP and dis some testing. Turns out the issue is that the ball does not transition smoothly from the inner orbit rails to the outer orbit rails. Instead it bounces between the top and bottom rails at the top of the orbit. To make matters worse, the top rail has no mounting points where the ball impacts so it flexes (causing the bounce) and the bottom rail is not even curved.
Here are a couple videos demonstrating the issue. The second is slow-motion where you can actually see the top rail flexing on ball impact.
I'm not sure why some POTCs have this issue and others don't, maybe the incline? One thing I noticed is that when the flex is removed from the top rail (pressure from behind) the ball still bounces but not nearly as much and orbits around faster. So for me the solution might be to add some sort of bracket behind the top rail at the point of impact. Any other suggestions or thoughts?