How to change the ear cushions on Sennheiser HD 400 series versatile headphones

This is a video tutorial on removing and replacing the ear cushions on your Sennheiser HD 400 series headphones, including these models: HD 408, HD 409, HD 418, HD 419, HD 428, HD 428-S, HD 429, HD 438, HD 439, HD 448, HD 449.