okay so i bought a 1978 kz1000 ltd and decided to go over it so i went to squeeze the hand brake and yeah it was a good bit tight, so while messing with the calipers and checking the brake pads i noticed the hand brake had suddenly gotten very easy to squeeze so i took the cap off the resivoir and pulled the diaphragm out only to find it had a quarter inch tear in the bottom of it, ive looked at over 100 sites and havent been able to find a diaphragm that matches the 4 screw resivoir, i really dont want to switch the entire master cylinder out because id like to keep it in as origional condition as possible for restoration purposes, does anyone know where you can pick up that type of diaphragm?