I went to my friend's place over the weekend and saw this. Story goes he was working in his shop...heard a pop... and then it sounded like a box of Legos being emptied out. Ouch! The machine hadn't been moved in years and nothing was going on near it. Just a spontaneous explosion. So he's looking for a replacement.... obviously. Located in SE WI. I'll pass along any leads. Thanks
Edit: Did they use tempered glass for bg's in the 70's?