i stole this:
Electro-Mechanical Pinballs
For Electro-Mechanical pinball machines, you need to remove the headbox rear access panel to gain access to the bolts and plugs inside. Usually this panel has a lock on it to keep it in place, but over time the key may have been lost. Quite often, there is a screw keeping this panel in place.
Once inside, remove the bolts and unplug the large connectors that have wiring going down into the machine. You may want to label these connectors to put them back in the right spot, but they should be different sizes, making it difficult to plug back incorrectly.
You can now remove the headbox completely, or fold the headbox down onto the playfield glass. Make sure you use some foam, heavy cardboard, or blankets to protect the headbox from rubbing on the cabinet. Foam is best, as it will help keep the back glass in place.
remove the pinball. remove the coin box. i'd remove the head and carry seperatly. take rear legs off, lower to ground. tilt up so coin door faces ceiling. take front legs off. now the cabinet can be strapped to a dolly. note when/when you fold the head, i use 1 strap to hold the head to the cabinet, and i use a 2nd strap to hold the game to the cart so i can rock it onto the wheels, and roll away. if it's just the cabinet, 1 strap, they're pretty light without the head attached.