I have made several attempt to make my own starter and failed each time. I end up with a nasty black pudding. I think it's the jar I'm using. My jar is 4 inches in diameter, 12 tall and has a lid that has a dual function, one to let air in, flip it over to seal air out. I have always used the "let air in mode". What kind of equipment do you guys use. Is there a starter on starters page you can recommend?