Quoted from Kevlar:
Slight occasional problem on my machine, a few times when passing balls through the full ball lock, all the walker fingers have dropped but the lowest ball just sits there because it's bounced back off the finger and sat in the groove. This ends with 2 balls stuck in the lowest part of the lock. I've tried making the machine steeper but it's still happened once or twice. There's no raised lip on the bottom of the groove. I'm thinking maybe the whole walker mech is set too far back? Anyone had this issue before?
I moved the walker mech about 3mm towards the flippers and the issue seems to be fixed. Even if the ball settles in the groove, when the mech fires the 2nd finger nudges the ball forward and out of the lock.
I find it strange the way the "1st stage go" & "2nd stage go " inserts work, if you lock 2 balls and get the callouts mentioned above the inserts don't lite until the countdown drops have been cleared ( even though you may not be at the countdown stage ). I thought I must have a fault but watching a gameplay video online that machine was the same .