Yes, the adjustable screw plunger that actuates the master cylinder ... located at output end of brake booster. Easier to access with wipers and cowling removed ... with master cylinder loosened from booster, but brake hydraulic lines still attached ... creating a little tool space. And you will need the brake pedal pushed by a person, or an object, for better tool access to the adjustment.
I've read that if you eliminate all the "play", the brakes will not release ... so this is an adjustment to be made with all caution!
Good that you have discovered and corrected the wheel cylinders.
Be sure to lubricate every friction point inside the drums ... don't go crazy, wipe up excess. Make sure to lube where shoes slide on baking plate.
Good luck!