In a lot of older games the playfield just slides on wooden frames when it's lifted. Then in the 80s they switched to a model that hinged at around 2/3 of the playfield's length, which may sound good in theory, but since the end of the playfield now sinks all the way to the cabinet bottom, just imagine how nice it is to work on something there. Hint: it sucks.
In 1992 Williams released this model. You can pull the playfield out for a quick work on the flippers, or you can just push it upwards and it'd end up like in the old days. The mechanism runs on metal rails, so it's really smooth too. I miss this model every time I open a modern game.

