With the game off (no power), open the coin door. On the upper edge of the coin door will be a triangular shaped lever that will slide to the left. Slide it to the left. That will allow you to remove the chrome lockdown bar and slide out the playfield glass.

The next part is the most important! Remove the ball! If not, it will drop out of the playfield when you lift it and smash either the plastic playfield parts or if you’re really unlucky, the backglass.

You just simply lift the playfield by putting your hand under the sheet metal apron where the ball drains, and lift upward. It will pivot near the back and there will be a prop rod inside the cabinet that you can use to hold it in the sloped up position.

Gotemwill's detailed instructions are exact. The only thing I would add is that if this is like my 1965 Bank-a-ball, there is an additional lock inside the cabinet that you have to pull toward you as you lift up on the playfield. It's a big brass bar that spans the width of the playfield............

My Gottlieb King of Diamonds (1967) has that odd playfield lock down bar just like you mentioned.

I believe "Spin A Card" does have the playfield auto-clamp. You must reach inside through the coin door, and pull the flat metal bar, about one third into the cabinet, toward you, and then lift the playfield by the card tray opening.

The playfield locking bar ended at some point during production in late 1968. Spin A Card is one of the first games without it.

You are indeed correct. My first pin ever was a "Hearts and Spades", and I thought it had the clamp. That was a long time ago, so the memory becomes foggy.