I have the Model T service manual, and it is great, except there is nothing on the water pump. I have some seepage from around the shaft nut area. Not a big deal, but the nut is loose. It turns easily, but I didn't want to disturb it until I can find out how tight it should be. Just snug? Since the shaft spins I don't know if I should tighten it very much. Thanks 23 T