Couple more things Pierce. You can Edit your post instead of doing another post. Taking the valve body apart is easy. First, mark the position of the top and bottom halves so you are sure to align them properly when reassembling. Put the handle in a middle position, that is not in one of the detents, to relieve spring pressure. Remove the 6 bolts and nuts and pull the top half off. The gasket and internal guts will be obvious. When reassembling it is always good practice to snug the bolts lightly and tighten in a sequence where you don't stress any individual bolt. ex...if you number the bolts 1 -> 6 in one direction, tighten in the following order..1,4,2,5,6,3. Tighten a little at a time until you get them all tight. The tightness in the handle could be simply the O-rings on the handle shaft are dry. I never lubed mine in 9 seasons but probably would be a good idea. That's not your waste leak issue though.
Al