Quoted from AlexF:
Really? So you have to take the head off every time you want to get in there. That is a pia. Still, having a Star Slugger seems worth the trouble.
I have had a few games where the glass (and playfield) slide out the back. Keeney Birdland is one of them. The head does not have to be removed. Still a pia as you have to pull the game out from a wall.
The board with the two wing nuts is removed to pull out the playfield and glass.