Quoted from Gtrefraction:
Just curious, does anyone else have issues with the ball getting stuck at the top of the spitter lane? I removed the wire guard at the top and haven’t noticed any negatives as far as gameplay?
Yep common problem. You don't need to remove the one way gate, just raise the left hand side marginally up (the circled end of the bracket should be just above the top of the ball guide). There is no need to loosen where the bracket attaches on the right side, as there is enough flex in the bracket to lift it the 1-2mms you need.