Yeah mate . The bracket on the underside of the playfield should be connected to the slide rail on the cabinet . When you raise the playfield you should lift the front up enough so the support legs ( near the flipper coils on the pf underside) will clear the front of the cabinet . You then slide the whole playfield forward until you hear a click on each side . Then you can raise the playfield right up and lean it back against the headbox.

The click you will hear is the piece that sticks out of the cabinet slide rail "locking" in to the pivot part on the under playfield bracket . It's basically a safety mechanism that stops the playfield dropping into the cabinet when you lift it up .

I can take a pic of the mechanism on my Williams Indiana Jones tomorrow and post it in here if you would like ( unless of course someone else gets in first ).

Cheers.