Pachinko Newbie With Ball Jammed Newgin Godzilla And No Key

[carrybagman]

Hi everyone. After collecting a bunch of Pachislo machines, I just bought my first Pachinko. Guy said it worked fine, and I still believe him, but when we met, he didn't drain the balls, and now they're jammed (I think). Shooter sounds fine, but balls don't get to it. Pushed them along with my finger and I could feel them going over a ridge or something. Feeding them this way, with a little push, worked for a bit. Now they won't move (and I hope I didn't burn out a motor or something). Shooter still sounds fine.

I want to open the glass to clear the jam, but can't figure out where in the back the latch to open it is. No key, so the back is my only option. Please help, and thanks in advance. Pics below!