Then I need my block to notify my block entity when it is right clicked. I'll override the use method as we did in the last tutorial. After checking that I'm on the server side and processing the main hand (so it doesn't get called twice), I'll get the block entity at that position. To be safe, I'll check that it's the right type of block entity but in practice it always will be. I'll cast it to my block entity class and call the toggle method. For dramatic effect (and so its easier to tell that our click was processed), I'll make it play a sound as well.