If all else fails, a replacement rubber part can be molded usting a latex mold. Clean the original rubber part and create a rubber mold by
painting it with multiple coats of latex mold material (available at artist supply stores). Carefully separate the mold from the original
part and place it in a bed of sand for support. Fill the mold with a silicone room temperature vulcanizing (RTV) rubber, or a Polyurethane Casting Resin (also both available at artist supply stores).