Hi to all, I'm building a 1/6 scale Galloway and still need some advice .On the mixer, how do you know how deep to drill in some locations.Is the needle valve going to leak without some sort of packing? Where does the needle valve port come out in the body? In the Taper from the 1/4-40 tape drill or in the center of the hole where the valve goes through.I feel stupid but I can't seem to pick up this info from the mixer drawing. Any help would be welcome...I have built the 1/6 scale Galloway but it has a different mixer. Thanks Gary H