How to open Disa Valve m43 m44 for changing membrane

Sorry for bad filming, just to many questions about how to change the membrane. Remember, i still repeat that not always this operation will help to fix your inoperative disa valve. Inside are air holes that are 95 percent stuck, about bushings, I don't even mention them. It's always better to buy a rebuild disa valve from me, for exactly yellow coins, still. For any question i am here for you! Thank you!